These people (not only MAGA) perverted the very meaning of antisemitism to the point that it means nothing today. I am saying that as someone who's lost a family member to Holocaust. When I hear someone mention antisemitism today, 90% of the time it is to punish someone's views critical of Israel.
Which is, of course, deeply antisemitic of the people claiming antisemitism when they are talking about only criticism of Israel, to equate all Jewish people with the Israeli state.
Same, having descended from Holocaust survivors, what is happening in the U.S. and Palestine right now is chilling to me in its similarity.
When I was active on the Politics Stack Exchange site years ago I was "reported to the ADL" for merging the [jews] and [judaism] tags. Right out of the gate after I casually mentioned it in another discussion: not even a big fight about it. But the same person outright ignored the Trump-supporting holocaust denying user who harrassed a Jewish user with antisemitic slurs such (e.g. [1]).
Sadly antisemitism obviously exists, and sadly some pro-Palestinian activists have veered off into antisemitism. But the selective outrage is hard to take serious.
Remember, Caesar subjugated Gaul and killed or enslaved about a quarter of all Gauls in the process, to "protect" them from invading Germanic tribes. "Top kek", as I believe the old Latin saying goes.
[1]: https://politics.meta.stackexchange.com/q/3596 – I am the author of that, I deleted my account since in large party due to all of this