I wouldn't say that Besaid is a bad server, quite the contrary, I know good people in it, and I can say it would have been my second choice due to my liking for roleplay and roleplayers in general. But honestly I see enough people standing around just to gratuitously bash the game and the developers in the forums without going out of my way to find them in the game as well
Of course, blacklist is always an option, but you still get to hear whoever gets baited by them, and the blacklist tends to get fat too soon.
The good thing about mysidia is that besides the first few days, i didn't really hear that kind of bickering anymore, while people are still quite social. If you ever chose it as a server, I'd advise looking for Redemption or Wings of Seraphim as possible linkshells of choice. They're both good and full of nice people,and accept low level players.
Even the Japanese population is friendly (quite a lot more than what I was used to in FFXI), and I can't really remember any time in which I was refused an invite to group.