As the saying goes: Take a step back and broaden the horizon. Interpersonal relationships are fragile and need to be carefully maintained with our own tolerance. I have two suggestions: First, if you just think he is speechless, but don't hate him, you might as well make friends with him. You can take the initiative to talk to him about something that makes you feel speechless about him. Everyone has his own different experience. Maybe he silenced you because of his interesting experience. I believe that in your conversation with him, you will find that he has a bright spot that you can appreciate. That's how so-called friends come.
Two: If things that make you feel speechless at first make you hate him, and you are not in the mood to be friends with him, then being a "stranger" under the same roof is also a good choice. But you should seriously remind him that you don't like what he does, which makes you speechless. I hope he pays attention. It is best to get the support of other roommates, so that he can get rid of this speechless practice and adapt to collective life under the principle that the minority is subordinate to the majority.
I prefer that you choose the first suggestion. Because in any case, it is your fate that you can live in the same dormitory. No matter how far apart your habits and values are, you should maintain a harmonious atmosphere, which is the basis of your "peaceful" life in the whole dormitory. After all, one more friend every day is better than one more enemy!