Jemal said:
There ARE certain things the players have to learn eventually. Just because you don't remind them about everything they can do, doesn't mean your an @$$hole (As implied very heavily in your post). If they can't be bothered to keep track of 1 thing, which (Following my PRIOR suggestion) they would know about ahead of time, then why would I want to play with such self centered people anyways?
True, the DM should be fair and impartial. Requiring your players to actually know the rules is, in my opinion, fair.
I see, and exactly how much does it cost you, in any way, to remind a player to take an attack of opportunity? Would that really be such a tremendous burden on you?