Agree with you there is no point in debating them, if it ain't self evident to them why they're wrong they're already a hopeless case.
That doesn't mean we should just take it in silence though. Returning the insults and escalating so they understand there is consequences to this disrespect can at least make them keep it to themselves.
It's ofc ironic that it's often the lowest of the low that believe they're superior to everyone else.
Question to the mods just do we know what we’re dealing with here. What's your stance on racial slurs? Is it condoned towards Arabs?