FIL is being disrespectful

I find my FIL to be a difficult person to spend time with or talk to. Because of this I don’t really have much in the way of nice things to say about him.

Last year, he decided he didn’t like me, because I slighted him. It was my birthday and I spent it in a psych hospital doing an intense treatment program. He messaged me “happy birthday” in the morning and I didn’t reply immediately as I didn’t have access to my phone. My partner got a phone call 20 minutes later of him yelling because I didn’t have the decency to reply to him. My partner calmly explained that I was at the hospital and couldn’t but would reply when I had access to my phone again, but FIL wouldn’t hear it. I had insulted him.

Fast forward to now, I’m 10 weeks pregnant and he is one of the few people who know (we’ve only told immediate family). My partner and I have a nickname, Chip, for our growing baby. Everyone will ask “how is little Chip going?”

But not FIL. He doesn’t like “Chip” and will only refer to my unborn child as JB, because he likes it better.

He’ll ask “how is JB?” And I’ll look at him blankly before saying “oh, you mean Chip?” And he will argue with me, “I don’t like Chip, it’s JB”.

Even my partner will go “CHIP…” with emphasis on the Chip and his dad will argue with him.

My gosh he is infuriating.