Well... Even if I someone triggers me like that, I can be rude, but not in that way.
If we consider the chronology:
At first the discussion was between Lost and rimseycat23.
Syndykator joins the discussion after rimseycat23 said "I'm Jewish". He said "It's not hate, just no respect" and "I only respect humans"
Then he says "You are Khazar". As far as I know, the Khazars would be descended for at least part from the lost tribes of Israel.
Later, he writes "Hahahaha" and "this jewee".
I fully agree rimseycat permanent ban, but whatever this stupid guy said, syndicator talk is not acceptable either. In France, he could be brought to justice for that
That's the reason why I would ban him also.