If you are just a thunder or blizzard mage, you are not trying to play well, you are intentionally playing poorly.
If you are not playing optimally when you can, if you know you are not doing your job but don't care enough to try, you are intentionally playing poorly.
If you do not take the time to learn your job or even reading the tool tips on your icons you are intentionally playing poorly.
If you are intentionally playing your job a certain way because that is your preference when you know there are better ways to go about things, you are intentionally playing poorly.
Especially at level 70. If you still do not know your basic rotations you have put 0 effort into learning anything and therefore you are intentionally playing poorly. Ignorance by choice.

If everyone in a group took a few moments to read what to do and try to do it, that is fine. If you refuse to use the actions given, aoe in a group pull for instance, which was brought up earlier. You are intentionally playing poorly and that is rude, that is trolling. You can play your way if you want, but I have the option to say, not with me, and boot you. And that is not rude that is my choice as yours is your own.

Funny you think I am not nice due to the way I think, because I think people who play your way, and not take people who actually put effort into learning how to play into consideration and expect to be carried, are not very nice people.