My BF (M40) moved in two weeks ago and I’m already noticing red flags. How do I (F32) adress this without getting into a lenghty argument?

My boyfriend (together 1.5 years) has been very adamant that we move in together, and we’ve now been living together for 2 weeks. But I’m noticing a few things that are bothering me and I’m not sure how to handle them.

The other day, I noticed that he doesn’t wash his hands after the bathroom. I’d noticed it a couple of times before but usually let it slide to avoid conflict. I was debating whether I should bring it up or not, but since we now share a household (my apartment, with my things in it), I felt it was important to remind him now that we’re living together and sharing a household.

He sighed, washed his hands quickly, and then started an argument, saying that he doesn’t wipe, so washing hands isn’t necessary. I told him that’s not very hygienic, and we went back and forth for a while. Later, he said he didn’t like to be lectured and that I should have been nicer about it. I disagreed, because I felt I had asked neutrally, but I let it go to avoid more arguing.

Then yesterday, while cooking, I noticed he had completely ruined one of my one of my nicer wooden cutting boards. He had used a bread knife to cut vegetables, leaving the surface rugged. I politely asked him to be a bit more careful with my things when using them.

Instead of apologizing, he tried to brush it off as not being important (its just a f*ing cardboard, his words) calling me overreacting and saying I should “pick my fights more wisely.” I stayed calm and tried to shift focus to avoid a fight, but I still had a feeling of this not being fair because my request was reasonable. It feels like he’s very sensitive to anything that comes across as criticism, but for me it’s not about criticizing him, it’s about showing respect by listening to what I’m saying.

There have been a few other similar incidents, and I’m starting to question this living arrangement. I know the things we are arguing about seem trivial, but I feel like he is lacking respect for my belongings because he doesn’t really care (he is not really careful with his own things either).

He’s renting out his apartment for 3 more months, so even if things don’t improve, we’re kind of stuck together. HOW do I bring this how do I bring this up constructively without it always turning into an argument?

TL:DR
After moving into my apartment, my boyfriend dismisses my concerns about hygiene and damaging my belongings and turns it into an argument. I feel unheard and disrespected. How do I communicate this constructively?