Worse than obnoxious Phils fans?
I don't know Phillies fans, but every season I go to Nats-Mets at Citified, and whenever the Nats play the Yankees at Yankee Stadium. If the Mets are bad, they abuse their own team. If the Mets are good, then all the drunken teenagers and dads from Long Island throw things at visiting fans. Maybe they have improved, slightly, this season: two weeks ago, only one group of Met fans sneeered at my Harmon Killebrew 1959 jersey.
Yankee fans, fans of the 27-time World Champion New York Yankees, are OK with any visitors except Red Sox fans, and then only when Boston fans try to start chants.