If you hugged Ralsei in the swan ride, then fought Spamton NEO, and said "No" when asked if they were fine, Ralsei will actually hug them again… then Kris will ask Susie to hug them as well (she refuses, naturally). Not to mention the fact they let Toriel hug them at the beginning of the game.

So it may be the case they like hugs, but only for those they feel a lot of affection to… which, alongside their reaction to the teas, probably speaks volumes to how Kris really views Ralsei…

I do find the idea of Kris being non-binary and Toriel using their preferred pronouns but still not allowing them to be gay a funny idea.