Holy shit, tell me about it. You could be talking about a new ability for say... I dunno... Rengar. And they'll just bring up some random shit outta left field and then act like it matters at ALL to what you were talking about.
Some schmuck - "Yeah, Rengar's old ult let him get away from ganks easily. But I can play Cho'gath, stand in a bush and be invisible... then hit you for like 1000 true damage if you facecheck me! That shit's broken! Therefore, Rengar's ult is fine!"
You - "What do those two things have to do with each other at all?"
Some schmuck - "1000 true damage bro. And it's point and click. Are you stupid?"
You - "No. And those still have nothing to do with each other. I'm talking about how Rengar's ult is supposed to be for ambushing people and it's silly that it's a foolproof way to flee. That's probably not what it's intended f-"
Some schmuck - "Man, I can't even talk to you dude you're a freaking moron! EVERYONE can see that Cho'Gath's ult is overpowered. You must be a Cho'Gath main bro. Trying to protect your freelo!"
You - "Are you serious? We weren't even talking about-"
Some schmuck - "Yeah, thought so. Ok, I'm done. You're not worth my time bro. Stay mad kid. Cya."
You - "What the hell even just happened?"