Family advice - my mom's boyfriend has shunned me

I don't know where to start. My mom's boyfriend won't talk to me after I asked him to take a covid test in July.

My mom and her boyfriend live a few minutes away. He has a few different values than our family but they've been together for at least four years now. We see them semi frequently.

Once during dinner at their house I asked if he, newly retired, wanted to volunteer at this certain nonprofit in town. He asked if it was in the bad or black neighborhood. I paused for a moment and said "that was racist" and we talked about how no, the historically black district had nothing to do with this nonprofit. My husband and I were really caught off guard but he makes statements like this pretty frequently.

In July my mom tested positive for covid about a week before the family reunion that was going to be at my house. Family from three different states were coming together. I was seven months pregnant, there was a seven month baby, etc. My mother tested negative before coming that Saturday. My aunt tested when she felt bad. He drove separately and came over later. I approached him with just him and my mom and asked "did you take a negative rapid test?" He didn't. I told him we had rapids in our bathroom. His response was "I don't trust them.". Then he walked through the living room to our front door and left. I have not seen him since. He knew I was pregnant, knew children were there, and that I had miscarried this year. He also knew he had lived in the same house as my positive mother for that previous week.

My mom wants to watch our daughter while I'm in labor and delivery (40wk currently). She and he were both exposed last weekend to COVID again so we talked for the first time about his behavior. She said he has intentionally avoided me since July because he doesn't know what he will say that will offend me. He said he doesn't want to be labeled a bigot and will start hanging out with us again after the baby is born.

She also said maybe he and I should sit down and talk together. She told me that maybe my delivery and tone need to change...

I don't look forward to going into labor any day now knowing that he was exposed to COVID and will not test. She fully anticipates watching our toddler and we have to tell her we have to treat him as positive.

Also he asked her to go out of town this weekend with him... She had to explain why she needed to stay in town.

Where do we even go moving forward from here?