how would y’all react to your moms new boyfriend not aknowleding you?

My mom started dating this guy in december and i can count the number of times he has talked to me on 1 hand. I met him for the first time in december a few weeks aftter him and my mom got together. When me and my mom were walking inside he held the door open for us. As i was walking in I looked at him and said and he didn’t say anything back…okay whatever we are about to go to a table and sit. For the 2-3 hours we were there, this man did not say one thing to me. We were at a table with me, my mom, him, his sister and her husband and their grandma. My mom was sat in between me and her boyfriend. His sisters husband got to know me more than my moms boyfriend and was literally the only one trying to talk to me. Her boyfriend even rode home with us that night and he still didn’t even try to talk to me. After this night he started staying at our house 5 nights a week. When I would come home home from work at night and walk through the front door, my mom and him would be sitting in the living room. He would turn around and look at him so I would obviously say hi, like I do anytime someone looks at me, and he didn’t say anything back and just turned away. Finally after experiencing this literally every night, i stoped acknowledging him just to see what he would do. So now when I walk in or walk bye him and I don’t even look at him or anything, and he doesn’t even try to aknowledge me. When he is at our house I stay in my room and isolate myself from the both of them. This shit bothers me so much because it’s exactly what my dad used to do to me as a kid. My dad was never in my life. I would only see him if he would randomly stop by my grandmas house while I was there. I would be watching tv or drawing in the living room and he would come and sit a few feet away from me and not look at me or say anything to me. After this happened a few times I started hiding in my grandpas closet when he would come over because I didn’t want to make HIM uncomfortable. I was around 7-8 (21 now) when that was happening with my dad. When I told my mom about it she was angry and brought it up with my grandma. Because it was still my dad’s mothers house it was a sticky situation. I’ve expressed to my mom that i’m not bothered getting to know her boyfriend and i’ve explained my reasonings. Of course she understands how I felt as a kid with my dad ignoring me but when it comes to a random man she’s bringing in to our home she’s confused as to why I don’t try to get to know him? How I look at is, it wasn’t my job as a kid to make a grown man comfortable, and it’s not going to be my job now, especially in my own home. And I have tried!!! Two times now I have gone out to eat with them, just being us 3. Both of these times he did not talk to me once!!!! On the car rides there and back, while waiting to be sat, waiting for our food, eating, waiting for the check, etc he didn’t not try to talk to me at all!!!! I’m starting to despise this man because of how it’s effecting my relationship with my mom. I’m even looking at her differently. I hate being home anymore and have looked into staying at hotels for the weekend. I actually just signed the lease on my first apartment and will be moving out in july. I talked about moving out a few months ago when I got my new job but put it on the back burner due to rent in my area being crazy and bc I had just been in a car accident. But with the way my mom and i fight over him I think it’s best I leave. I love my mom but my god am I hurt and angry over this whole situation. My mom even told me “I hope you’re moving out for the right reasons.” I personally just think it’s a major red flag if my partner can’t talk to my child, but i’m not a parent so what do i know.