You lost me at algebra. All anyone has to do is their best, nothing else is required of them. It's all about expectation at the end of the day. Sometimes people expect the roads to be clear when they drive to work, sometimes they aren't cause that's life. Sometimes, you expect someone to know the dungeon and their class like the back of their hand and also to move at your desired speed and pull the desired amount of mobs you see fit; at the end of the day it's expectation. Maybe it's my expectation that people understand the role of a tank, I suppose I'm guilty for that but the mechanics of the game, and pretty much any game, lay out what the role of the tank, healer, and dps are supposed to be, we wouldn't have roles for them otherwise.
If you are in a group where people are being obnoxious, just do you, all you can do at the end of the day is the best you can, don't sweat it. Hopefully these "experienced wonderful players" will offer advice and try to help but if the end result ends up in you getting kicked then so be it. I haven't ran into that myself but just saying, don't get discouraged. These things take time. It takes time to learn mechanics, dungeons etc and to be able to perform, if you choose to do so (it's really not required and sometimes just makes things more stressful imo), how some of these other players are performing. Tanks can be just as guilty of this as well. Running ahead without paying any mind to your group or even testing the capabilities of your healer isn't a wise decision imo. There's that expectation again... Now those that accept the consequences of their actions and provide constructive criticism and adapt to the party to make it through, I don't have a problem with. To be honest, I don't have a problem with any of it anymore. You play how you want, I'm gonna play how I want. If you don't like it, you can vote dismiss, I'll get into another group in 5 seconds lol. And that's the mentality people should have. You can't control what other people do, and if they have narrow minded expectations, that's on them.
All of that being said, yes we all like for things to move rather quickly and to get done in a timely fashion, I want this too. I've had some pretty bad tanks myself that don't know how to hold aggro etc. and it's frustrating but I just do my best to support the group and make it through, that's me. I do offer advice but sometimes they don't read lol.