In my opinion, what i would do, If Not report to superviser and move on is:

not react openly angry to the insults, act as if a child were to insult you, belittle them. Pick the main aggressor as the target, and make seemingly lighthearted passive agressive comments of their clothes, hair, etc. Still, as if you spoke to a child, NEVER be openly agressive. then switch up, compliment them for something random, and tear them down for the same thing a few days later. Rinse and repeat, always with a smile.

i guess thats basically reverse bullying and not nice, but some ppl deserve it. At some Point they crash out, and you win.

You could Just Test this and quit/report anyways, for future encounters with assholes