Hux meets his boyfriends Parents [for whatever reason how their paths cross is up to you]. Kylo notices Hux is immediately tense. Hux tells Kylo that his father is menancing.

But the truth Hux is terrified of General Leia Organa and doesn't want to admit it because Leia is a tiny harmless looking old woman who is pretty much half his size and would be embarassed by it.

++ Han makes a snark comment of "Don't worry I am scared of her sometimes too"
+++ Leia gives Hux the Shovel Talk at some point and that's why Hux is scared.