Unfortunately i don't think we can change peoples mentalities. People will disagree on certain issues, dislike certain members and like other members, just like real life. That for me, is what makes a forum so good. I disagree with the post count/join date argument too. The forums been going strong for so long it doesn't matter when you joined as we have good and bad posters from all "eras" just like we have good posters with under 1000 (Valeoz, nice post) who are good and posters with 7000 - 12 000 who are idiots, but once again, it's all opinion and perspective.
For example, Bank Robber comes across as a twat to me, lots of posts, early join date but there's plenty of people who like him and find him a good contributer. It's only the people who annoy the majority who are the problem. Thuggy has loads of posts early join date, never seems to post anything of substantial depth yet i dig his humour. Everyone plays a different role, it's just when that role is not wanted by the majority that it causes a problem.