Honestly, "Those are the eyes of a rat" is a fairly tame insult compared to the kind of toxic drivel Jones usually says, and seems like weak grounds for termination. He should've been kicked off long ago, but I fear that having this particular example be the "final straw" is only going to strengthen the alt-right's persecution complex.
It does seem tame, but a quick search suggests it may be an anti-semitic dog whistle.
In fact I suspect you have it backward. Jones will be intimately aware of (some of) the far left and (some of) far right anti-semite culture - it takes some character to see the big picture and in my personal exhaustive experience with that world most people exposed to those cultures would become anti-semites fast.
Jone's nemesis is altogether more abstract - he sees himself as crusader against a modern meme similar to communism or fascism.