Your immediate reaction to a non-jewish person having the temerity to talk about how their community suffered from Nazi forces during WW2 was to label them "anti-jewish". That's messed up. The fact that they mentioned "lobbying" doesn't excuse you.
There seems to be a strong undercurrent of anti-gentilism from several commenters on this story. The response from admins has been very strange.
I'm not sure I see evidence for anti-gentilism. I'll give the benefit of the doubt and say over-sensitivity, or paranoia. But accusations of anti-semitism are being thrown around far too freely. Discussions of non-jewish victims is not anti-jewish, and it should not be shutdown by trying to shame or accuse people.