"nemesis"? lol jesus shit what the fuck, this dude

here is what i would do:
bring an opaque thermos to class and fill it with gin. whenever he speaks, take a small drink. the more he talks, the less you will care.

if that's not your thing, the only other thing i could think of in terms of interaction is being overly nice to him. if he wants hostile attention, he might not even know how to respond to a person being extremely polite and sweet.

out of curiosity, how long has the current "nemesis" been a nemesis??