I(23M) don’t know how to confront foreign roommate(20M) about proper bathroom etiquette

Hi, so I (M23) just moved and am living with a random roommate(M20) for the first time.

He is a foreigner, and I know his culture plays into some of this, but he leaves the bathroom in disgusting shape and I don’t know what to say.

First, he doesn’t flush used toilet paper in the toilet but puts it in the trash can, this I know is because of cultural reasons, however I am not sure about the rest.

He also doesn’t flush his pee, leaves pee on the toilet seat, doesn’t rinse the sink after shaving-leaving his hairs all over the sink.

I had to go in and pull a giant hairball from the drain, and its just been a little upsetting with his seemingly lack of awareness. I am not a confrontational person at all, very agreeable and don’t like to make any sort of conflict. So I have been bitting my cheek for awhile, but its starting to drive me crazy.

We rarely actually see each other, have only had 2 conversations before, so it makes it even harder to confront him about it, and I don’t know what to do or how much of this has to do with culture.

With not flushing, or rinsing the sink, I am confused if it’s a customary practice in order to save water or something.

If its cultural I don’t want to be too mad about it or culturally insensitive, but also feel like some of these are not culture but him just being lazy.

I understand not flushing toilet paper, but not cleaning the sink after he shaves or wiping down the toilet seat if he gets pee on it is just inconsiderate and unfair to me.

Please what should I say, how should I go about this, I feel especially nervous because like I said we never talk and I am not a confrontational person.

Been living together for 5 weeks, and have had 2 conversations. Don’t really want our third conversation to just be me nagging on him.