Here's what I base my hatred off of.
I've been to Devils games at the Garden and Wells Fargo Center. Ranger fans can talk a lot of trash... most of the time it's uninformed drivel... but at the end of the day it is safe to see the Devils at the Garden.
In Philly the fans there are so obnoxious and out of control it's actually not safe for away fans. They make you feel like if you cheer to loud or look at someone the wrong way you're going to get physically harmed.
Same thing on the ice. I respect a lot of Ranger players. Hard working hockey players... I would take Callahan, McDonagh, Del Zotto, Girardi, Stepan, Richards, Nash, Kreider, Lundqvist on this team any day.... But I cannot stand the "brand" of Flyers hockey where it's acceptable to head hunt, cheap shot, and try to injure a team when they are beating you. I have absolutely no repsect for players that wear that uniform. To be quite honest, if I were given tickets to a Ranger Flyer game and was told that I could go but I had to support one of the teams, I would gladly throw on a Ranger jersey. I hate the Flyers that much.