Classes descrimination for dungeon groups

I have been in so many groups for dungeons. Everyone groans when you get a tank that has green gear, it doesn't matter if it's only 1 piece, they don't like it. I really don't think there is a big problem with it if it's just a simple dungeon and not on heroic, I mean the dungeon finder is so advanced now, it will only let you in if you have the recommended minimum gear for the dungeon, but that doesn't stop the prejudice.

There are more cases of prejudice, and this has more to do with classes, and I can honestly say that I am one of them. I will not group with hunters. Period. This is because I believe that there are very few people that can play the class well. I have been wiped so many times by a hunter's pet on aggro, or not letting the tank get initial aggro by doing too much damage in the beginning of the pull. I absolutely hate paladin dps. If you are in a high end guild, you have the gear to back that up, but most paladin dps in the dungeon finders, are alts that are switching specs, don't know the spec that well, and have crappy gear. I'm sorry, I don't like it, and usually I will leave if there is paladin dps in the group. I am a bit wary of warrior dps, but that's not as hard to play up as paladin dps, so I check the gear and usually we're good to go.

Now I've played a rogue main for so long, that I believe there is protocol for rogues in groups, and I feel that most people haven't learned this because they joined after the first expansion. I remember when kicking was very important, and distract and sap. Most of all, when in dungeon, you should have master of deception, cause the mobs can SEE you. I think deception is necessary for pve rogues. I won't go into the exact protocol, because frankly it's like manners with people today, you just can't teach that. The lack of this protocol tells me that the player just doesn't know how to play the rogue class. It's usually an alt, with not such good gear, and terrible damage.

I seriously don't care about gear, so I won't be rude or boot anyone from a group because of that, but if you don't know how to play your class, that is just it for me.