I've come to learn, through multiple examples, that when other Fediverse admins say "We're going to investigate your user's reports of antisemitic harassment." what they really mean is "We don't believe Jews when they say something is antisemitic and we'll come up with reasons why it's not antisemitic, and it's not harassment."
The idea that Jews can't be trusted to decide what is antisemitic is itself problematic, and we experience this and other antisemitic issues with admins so much and so often that I'm going to say loud and clear that the Fediverse has a very serious systemic antisemitism problem.