It's not just you
I'm somewhere between B2 and S4 most likely, according to other ppl I've seen and been told. I barely managed to pull off B3 in my placements because I got 70% terrible supports.
I got a bard that didn't ult once in 20 mins, despite us dying like 5 times, and then after getting told to ult he ulted the fed enemy carry which saved them. I don't think he was trolling, I think he was just very bad.
I also got supports that didn't ward even with their trinkets, and I had to do that. I would ping the river push to tell them to ward, but nope, they didn't until I asked or pinged a lot.
Teemo supports are sometimes terrible, idk its people who pick teemo just to troll cuz they don't like supporting. But in my experience they are the ones that are trolls or very bad; I honestly get a sinking gut feeling when I get a teemo supp.
I had a teemo that fed twice in 5 mins, as well as letting the enemy focus me and didn't attack or blind them so I died twice there. Then he died again. The enemy adc was 5/0/0 at around 5-8 mins, just because I made the mistake of putting 1% trust in him. Then, best of all, he left lane and went mid to troll farm the jungle camps while I was left 2v1. All the pings or begging in chat wouldn't change a thing. I proceed to spend the next 5-10 mins getting almost totally zoned from cs, and getting killed while under tower. My team only came to help once; I guess they were part inconsiderate, part just staying away from an impossibly fed lane. After that we were teamfighting and this teemo wasn't there, but came in after to ks and then proceed to feed. We were then defending our base and teemo was busy troll farming the mid raptor camps while our base towers/inhibs were getting destroyed. I have never before raged, or sworn tons, or said anything malicious in chat, but this teemo made me FULL CAPS LOCK RAGE. At this point my team had realized how toxic teemo was and vowed to report him. I never played adc for like 4 weeks after that, no joke. I am mid/adc so I just went mid. Thankfully I'm out of that elo hell, but ya autofill supports are bad generally, even in ranked.