It’s fairly common and long established that there are fights between opposing fans, especially when the away fans trash the place they are visiting or otherwise disrespect it.
Labeling them (the Dutch hooligans) as antisemites can do nothing else but strip all of the context out of why what happened last night happened. It’s saying they are attacked because they were Jews, not because of the behaviour of the Maccabi fans the day before, during the day of the match or at the ground. I think the latter provided much more of an influence here than the former.