These players (and people in general) sound like they are ridiculous and insufferable. I can honestly say in all the time I've been playing I've been fortunate enough to encounter very few adversarial players and on the rare occasion we did we had absolutely no problem booting them immediately, mid game. We mostly kept our circle of players to friends so we rarely had these problems. Dont get me wrong I've played at a game store and with people I didn't know but even then I met some strange people none come to mind that I'd consider adversarial.I've seen two flavors of this. Some player seem to play as if they were in competition with the other players, and strive to make the most powerful character. I had a player who wouldn't be satisfied unless his character had an AC at least five points higher than anyone else in the party, and hated the fact that his character could actually fail a Saving Throw.
The other sort is adversarial towards the DM. That is, they seek to "beat" the DM, often through rules-lawyering or flat out cheating. Some go so far as to try and derail the campaign, to prove that they're "better" than the DM on some personal scale.
I don't see this as adversarial if roleplayed well, in fact I've done this and see as the opposite. I'd say a player who expects the party cleric to heal them or cast other spells for them just because they can without contributing to help spread the teachings of the clerics faith is somewhat adversarial. Now I'm not saying that a players needs to contribute gold for every hp of healing but there should be a mutual understanding in the party that the cleric will heal and the rest will help spread the faith.Clerics who refuse to heal unless paid.