He refuses to put toilet seat down after use

I know this isn’t a huge deal but just looking for some advice. He started doing this a few weeks ago, I’ve lived with him for 4 years. I have asked like 4 different times now very respectfully and nicely for him to put the seat down after he goes. He responds “no, you need to leave it up for me.” And I’m like um no. And he just keeps doing it every day. He even asked why should he. I said because I’m use to it being down and I don’t want to fall into the toilet one day. He laughed but he still won’t put it down. He also started refusing to replace a toilet paper roll if he’s used it all. And he burps obnoxiously more than usual and doesn’t brush his teeth like he use to. It’s just annoying him not wanting to be a gentleman for me anymore. Halp