It’s because of the parallels people draw between the current far-right Israeli govt and their rhetoric about the Palestinians and how they treat them and how the Nazis treated “lesser” beings i.e. calling for all Palestinians to be wiped out, that they’re “human animals”, “children of darkness” whilst Israelis are “children of light”, the implications of what the Israeli regime imposes on Palestinians and the systematic racism and much, much more.
I have heard multiple Jewish activists also call the current Israeli govt Nazis and draw direct comparisons between the treatment of Jewish people under the Nazis and the treatment of Palestinians under the Israeli govt. I have also heard this from Israeli Jewish people.
That being said, I think putting a Nazi inside a Star of David is wrong, especially as a non-Jewish person and if the star is clearly not on an Israeli flag, then even more so.
However, I’d say that the insinuation that she is a neo-Nazi is incorrect, I think the sign was a very, very poorly judged mistake, as it would of course be very upsetting to a decent amount of Jewish people.
I do think that some people want to make the most provocative signs that they can (probably with good intentions) but misjudge and create something terribly offensive, but these are really few and far between.
I also don’t believe there is implied malice behind the sign towards anyone and everyone Jewish, I believe it’s aimed at Netanyahu.