As I’ve implied, there is a case to be made for callng it anti-Semitism. This was the collective punishment of a group – the majority of which did nothing wrong and who may not have been travelling together – based on their presenting as devout Jews (as you say, a protected class). That’s why I don’t have much problem with the fine.
But when a member of the Hasidic community faces consequences for behaving like an arsehole (e.g. delaying a flight and bothering other passengers) and either he or the community plays the anti-Semitism card as a defense, that’s crying wolf as @anon67050589 notes.
And a very very bad look given the history of the airline and the religious group in question, as @Brainspore and @Beschizza pointed out.
That tends to be the case with religious fundie pilgrims in general, going back to the middle ages. If they want to risk entering a conflict zone or risk getting trampled in a poorly organised visit to visit some symbol of their belief, that’s their business. But when that stubbornness extends to bothering or endangering others, situations like this eventually occur.
