Pretty sure the harassment only occurs when a new player joins those "farm party" groups. The following harassment comes from both sides.

Player "I know this fight, killed him 100s of times"
Group "Well, "him" is actually a girl but ok, let's defeat her.
*instant wipe*
Player *silence*
Group "Why didn't you do XYZ mechanic, that caused us to wipe!"
Player "I play the way I want!"
Group "I don't think you know this fight..."
Player "Don't be so elitist! And there were no other parties in party finder!"
Group "Make your own?...."

I know the "learning party" groups in party finder are fewer and harder to fill, but they *do* fill and people do get practice that way. I think the desire to join a experienced party is too tempting though... The problem is they aren't fooled.

I get the reverse treatment lately... I could be fully outfitted by the bosses drops and join a "farm party" in party finder to find out the leader hasn't set foot in there before. Then he promptly calls me out when I did nothing and blame me for the upcoming wipes saying *I* have never done the fight (when obviously I have to have gotten a whole arsenal from the boss). These games of who has done a boss and who hasn't gets really old. I get most harassment from the players that haven't done the bosses.

If there was some sort of separate mode for beginners, would beginners actually join it? I don't think they would. From what I've seen, it would be a mode that no one uses.