I have lurked a lot of football boards and the Ravens are the worst IMO. Why?
2 months before they let you post freely - AKA these fans are so freaking over sensitive to anything that does not fit their narrative. They make it hard for other fan bases to integrate in. The OP mentions this. No other fan site pulls that crap that I have been too.
All fan bases are guilty of double standards but Raven fans are the worse. They have murders (or accomlices) and scum bags on their team. They had people that roided big time and still do but then they go into "they mad cause we ball so hard!" If any other team has character issues or has complaints about cheating they wine so much about it particularly the Patriots.
Example: Lewis maybe kills someone - Can't prove it! He didn't do it! He is a great man!
Hernandez Kills someone - LOL typical Patriots. What a "classy" Organization. Patriots Way = Murder
Their team maybe cheats - They mad cause we ball so hard!
Other team maybe cheats - Cheaters! Take their ring! Asterisk!
There team wins - LOL they crying cause we ball so hard!
Other team wins - Cheating, Refs, Fluke!
Also the fan base as a whole on that site is just not very informed compared to how fanatical they are. They are clearly passionate fans but there are less savvy fans there IMO then other places with big fans. That could just be my personal experience though as that is something you need to look closely for.
Also it is amazing just how in general unclassy they are in victory or defeat.
Now I am not trying to speak for all Ravens fans. I am talking about the % that are like this compared to the rest of the fan base. I think their % of these kinds of fans are higher than others.
2nd worst is probably Seattle.
There seems to be a correlation between "we hard knock" teams and bad fan bases. That culture kinda creeps into how the fans act.
However teams like the 49ers have that same kind of team culture and their fans are pretty good actually.