I'm mostly nice to the tanks. Unless they decide not to communicate. When I yell "help agro!!" in the chat (and even running towards the tank) and he does nothing, I ask him why he didn't pick up the add/boss (yes I had agro from a boss once, protectors...). They sometimes don't even respond, not even when out of combat. So when that happens you have to excuse me for getting a little mad and yell at that tank... No trash talk though, I know tanks have feelings too.
I don't tank in lfr myself, last time was DS. It was also horrible back then. I don't mind if ppl tell me what I'm doing wrong, I do the same to others as it's important to learn from your mistakes. I just don't like the raging and abusive ppl.