Should i interfere with his choice?

I know a guy, who i’m not very friendly with anymore due to what i’m about to say. This man is from the middle east (Iran) and now wants to join our tribe. We both live in the same european county. He’s been talking to a rabbi in his city and it seems like he really wants to do this. What’s worrying though is that he’s been very anti sionist (excuse the typos i’m making). We were casually talking about the jewish country (i’m changing words due to the bot possibly removing my thread) and he’s saying that we are doing too much, and that he’s always try to be victims. Which is funny because….he wants to be one? He’s been liking very anti jewish country posts and agrees with anti jewish country profiles that are even seen antisemites. His rabbi doesn’t know about this but i don’t know what to do…

Should i tell them about this? The shul is orthodox and when i tell him they wont like this way of thinking because its antisemitic he says they’re not extreme like me (a sionist) i guess and he makes weird remarks that i think like an ashkenazi. It’s just super weird.

I need advice.