No one in this comment chain was making light of antisemitism, though.
I feel like I'm about to ruin the joke but....what makes their comment so funny is that they're (jokingly) missing the point and going off about something irrelevant with a fully-formed argument.
I fact checked in the first place to send to the same Jewish friend who once told me he hated Hitler....for taking that mustache style off the table for everyone. Not a guy you can accuse of not taking antisemitism seriously.