He didn't hit on her.
Jean just read his mind and told him not to hit on her in ear shot of everyone including X-23.
Was it Jean?
Could have been Emma?
Slim is not so good at following through.
Maybe dear old dad can teach him how to pick up space clunge in the Star Wars Cantina?
"I'm not being sexist son, but out here, there are waaaaaaay more genders than just two."