I know that he's probably one of the most annoying champions in the game, ever since i started to play this game since early S4 Teemo was always hated. May ask why? Is it that he can successfully zone any melee champion from level 2 ? Is it because he's a yordle? If there is someone who played for very long time can answer this question?
Raka Flaka MD8 votesWhat's a shroom for 500 please.
Alakalzam7 votesHe's small, cute, mocks you with his blind, and leaves shit behind that you're always tripping over. Then if it kills you because you were at low health, you feel shame beyond any measure.
That's why.
Edit: The fact that lots of baddies loved him and played him didn't help. I remember teams banning Teemo because someone on their own team wanted to play him haha.
BeatzBoyFTW5 votesWhen playing as a melee champion, taking 1 CS = 10 Teemo's autoattack.
Now wouldn't that be annoying as fk, even as a Garen.....
Ice Weasel X5 votesDon't forget that Riot officially embraces the Teemo love/hate culture.
Etiquette
Follow the Universal Rules and keep content focused on appropriate topics for these boards. We want a place for everything, but if we don’t keep things organized, the boards become a lot less useful and a lot more cluttered.
Join the discussions with posts about your favorite or least favorite champs, or rant or reason about recent balance changes. Leave questions and feedback for the teams working on champions and gameplay. Most importantly, always vote for posts based on how valuable you think the content is, and mention Teemo as often as possible.
LF Annie4 votesi would say it comes from a time when he was much more then the shell he currently is.
Shadow Gilgamesh3 votesWell, he's from a bygone era where that speed boost, invisibility, and blind made him extremely slippery. Back in the day, mobility was the exception, not the norm, entire champs would be incapable of damaging when invisible because targeted moves were common, etc.
These days the hate is partially just the meme of hating him from the old days, but the rest of it is that there's STILL not really much you can do about the fact that any time you aren't under tower or following a minion wave every step you take you risk losing 40-60% of your health from a shroom. Even with a few seconds of true sight from oracles (something that is a costly choice to pick up on anyone but support now that green wards are gone) it's nowhere near enough to deal with them.
SSJTribe1 votesThis, definitely. Used to be he was this speedy little guy you had almost no hope of catching, he'd just kite you around everywhere. And juuuust when you think you're finally going to get him, you get slowed by a shroom. Then the process restarts.
Sire Hippington2 votesBack in the days, gapcloseing mechanics were more rare, aswell as abillity-based ad champs, his bind did last longer and the shrooms had less cd while lasting longer and doing FAR more damage. For most ad-champs, faceing teemo was true terror, same for most melees. As ad-melee, you simply were fucked.
But mostly, it were the shroomfields, and i will continue to hate him as long as those shrooms remain...
MunchCrunchLunch2 votesthere are champions way more annoying than teemo. gnar. heimerdinger. ziggs. to name a few. i think people hate teemo because out of all of these he can carry games and make a difference while the above are just nuisances.
Nekusen1 votes1- blinding making autoattackers practically useless
2- shrooms taking half of your hp just by randomly walking around.
Shroom Junkie1 votesIts the blind, and the shrooms. Mostly the shrooms. Lots. And lots. Of shrooms. That kill you.
Shrek Luigi1 votesI hate Temma because he's not a very good champion and every match featuring a Temma is goofy
Wînter Fox1 votesJust imagine:
How can you not feel anything but pure rage and loathing?
Wolfenstin1 votesI never found him all that bad. He's annoying, sure, but the spawn Satan? Eh, that's just a meme if you ask me.
There are far more annoying champions than Teemo today. Teemo is nothing more than a relic that was the annoying flavor back then, and now there's new, even more obnoxious champions to rival him. I won't mention names, but believe me, Teemo tips his hat to some of the champions in the roster now a days.
IcyPepper1 votesYou know, I played Teemo once.
People went out of their way just to focus me during teamfights. Like, I wasn't even important, they saw me and they all focused me at once.
Teemo is just one of those champions that makes people let bygones be bygones, get together, all to beat up that Satan hamster.
Also his lines. His taunts. His laugh. It drives anyone insane.
Mael bro1 votesYou know, I played Teemo once.
People went out of their way just to focus me during teamfights. Like, I wasn't even important, they saw me and they all focused me at once.
Teemo is just one of those champions that makes people let bygones be bygones, get together, all to beat up that Satan hamster.
Also his lines. His taunts. His laugh. It drives anyone insane.
Size doesn't mean everything 
Size doesn't mean everything Size doesn't mean everything Size doesn't mean everything Size doesn't mean everything When i spam any of his emotes, people immediately try to focus me.
Koldheartedjsp1 votesmeems and the gang mentality is 90% of the reason