Do you think it’s possible for a jew to be antisemitic? As I have a work freind who might be

Hello/Shalom all, like the title says what do you think?

A bit of backstory at my workplace there is a new hire there is a new hire who we can call H (18M) whose been there for about 3 months. Firstly H has autism and is incredibly intelligent but he has very strong opinions on a variety of things and how things “should” be.

I assume H is Jewish although he’s never outright said it, I assume he is because he has a hebrew last name, I’ve seen him read the torah on his phone amongst a few other things.

However when talking about Israel H believes that zionism is a “setteler colonialist” ideology which he claims cannot exist without the “subjugation” of another people, he also claims that it has nothing to do with religion and it never has. But obviously I fail to see how someone can claim jews don’t deserve self-determination but not be an anti-semite.

So what do you all think? Can a jew be antisemitic? And any advise on how I can deal with H would be greatly appreciated thank you.