It’s clearly indicating that Charles is trying to find a fellow mutant to connect with romantically. Raven’s off the table, since she’s his sister. But he wants to find and build a romantic bond with someone who has a mutation, who is different like he is, and he’s resigned to searching for things like heterochromia and auburn hair because he doesn’t know for sure if there really are more full mutants out there with actual superpowers.

Literally the only reason he starts flirting with Moira is that she has auburn hair, i.e. a mutation.

Then he meets Erik and all the flirtation with random heterochromia women and with auburn-haired Moira stops. Because Erik is what he’s been looking for.

dan and phil are dan and phil

dan and phil are gay

you are gay

you will get through this podcast

it's a monday

you are hard

twitter isn't real

twitter can't hurt you

there is not a man in the room (besides your partner)

dan and phil are not in the corner of your room

dan and phil are not under your bed