The thing is that the antisemitism has always been present in the United States, and I don't mean the bs kind where if you criticize the Israeli government for using police state tactics against Palestinians, I mean the kind where you have folks going full Hitler apologetics and other such vile things. I've experienced this quite a bit throughout my time on the Internet. I think part of why it persists is the fact such beliefs can propagate more easily and with little push back through the Internet. I don't know if deplatforming even works on such things but I'll say at least there's the block button and block list functionality for platforms like Twitter, so folks don't have to listen to such tripe for long.
