I hear ya. However, I don't think F2P players can post on these forums, AND, chances are if they are that inconsiderate in-game I highly doubt they are reading the forums for self improvement
I don't know what I would do in your situation though... Advertise you are only LFG with players who have subs? I don't know if that breaks any game policies but its equally not fair to be forced to have your game experienced ruined by players who have no consideration for anyone but themselves. The other possibility is that there is an explosion of very young players (as in >12yrs). For obviously reasons, this player demographic would rarely make for a good group.