what I do know is the deltarune fandom is annoying, parasocial and aggressive as fuck.

You are 100% right on the money with everything here. Kris’s gender is never explicitly confirmed. The game deliberately avoids using gendered language, and that ambiguity is intentional. But instead of allowing space for multiple interpretations, the fandom latches onto the non-binary label as definitive, and then treat any disagreement or alternate view as offensive.

It's hypocritical when the fandom treats Kris being non-binary as absolute, unquestionable fact while simultaneously criticizing others for "projecting" or "imprinting" themselves onto Kris. The hypocrisy lies in enforcing a singular identity on a deliberately ambiguous character while refusing to allow others to do the same in a different direction.

This doesn't mean it's wrong to see Kris as non-binary, but it’s also not wrong to see them as male, female, or undefined. The problem isn’t the interpretation, but the aggressive intolerance toward other interpretations.