How are you defining them between casual and troll? No-lifers who think they are casual because they dont raid that think they speak on behalf of time limited players, former raiders who think they represent all who do LFR despite being a minority of the LFR population, or just someone who says something that you dont agree with?
Players have said it and players have defended it, troll or not. To a point I think such arguments are really just players grasping at straws over being angry at other players doing more and being more happy in the game than them. The earlier arguments of to see the content have largely been shown to be BS to cover just wanting character progression and something to do. Why cant players be more honest and constructive with their wants and needs. It is like they feel it is selfish and mask things in order to appeal to a larger audience. The issue with players using the casual label as an excuse or crutch is not all casuals are alike and the majority really isnt a majority when you start looking at all the different play styles and interests in gameplay. There are those who love only dailies while those who only love dungeons. There are even those who will level characters over and over again, while others do things like play the AH. Just because everyone levels doesnt mean they enjoy leveling, but hey if someone levels that must make them apart of the majority and surely everyone must think alike and want the same thing or at least that is how some sound.
People always think of silly reasons or claim some sort of right or entitlement to get what is out of their reach.