Wow. I sense someone.... salty. :P
Let's have some fun.
Pls, if you cant support dont call it i rather play support than play with a trash support.
I don't quite main support, but I play it a lot. I also belong to a teamspeak community. Very, very few people call support every game. And I remember climbing the ranks. Part of why I play as much support as I do is that it was the least wanted position and still is. Heck, last night I called top only to have to switch when the group discovered that we had 2 members who had no support champs at all.
As for what you "noticed"
- Never tank anything during trade
I can't tank if the other team decided to focus on the ADC. At that point I can try to peel, heal, and CC as well as use my abilities to try to stop the trade. Sometimes I succeed sometimes I don't. It partly depends on how the trade started. I've had my ADC charge past me and dive the enemy turret and then complain that I did nothing because I stopped at the edge of the turret's range after they already had gotten turret agro on them. Not much I can do at that point.
- Never auto attack especially the melee ones
I don't play the melee supports much, but most supports don't have a lot of damage in their auto attacks. The better ones also have been told many times to not AA minions so I find I spend a lot of time positioning to make sure I don't shoot minions. that said since I do play Zyra and Sona with spellthief's. I do a lot of poking with my AA and abilities. But this is up to the support. Many don't like to dive the enemy ADC unless they are sure they won't end up doubleteamed or even tripled if the jungler is nearby.
- Dont know how to help cs under tower
In my experience a good support will be poking the enemy champs if you have been pushed under tower as a way to try to get the wave moved back a bit. And again, good supports don't AA minions unless told you.
- Pushes the lane when adc is freezing to get more advantage
Was your support trying to farm? I've only seen this from Morgana supports who plan on becoming a mid/late game carry. In this case you don't have a support, you have a duo lane. Sadly that's going to come from having certain supports, and there is nothing to do. Most often its because someone who didn't want to play support had it forced on them, so they play a regular champ and struggle to make it work
If you feel like being useless to the team, go play devourer jungle. dont pick a role that can screw up 2 people just because of you sucking dick
Very few supports are useless even if they have low CS. The CC and utility they can bring is vital in team fights. It sounds like you have run into poor ones, but also that you don't understand how to help the support play better. I can say that your attitude won't endear you to many supports. I personally HATE having an arrogant ADC to work with. They seem to expect me to know exactly what they are doing and to be in perfect position even if they make a bad play. I've had more than a few ADCs whine that they died after ignoring my danger pings. I even had one complain that I finished off a champ after the ADC had been killed. (I had been returning to lane after backing for sightstone and my ADC went all-in on a 1v2 before I returned. I got to him just after he died, and killed the surviving enemy champ.)
Support is a thankless role already thanks to ADCs like you. Personally one like you is likely to get me to want to call to the rest of the team asking if they'd like my help because it sounds like supporting you is a lost cause. Of course, doing that would just get you killed again and again and almost certainly cost my team the match, but people like you make it very tempting.