what would you do?

So my SOs friends think it's funny to joke around with my SO and say this baby was a mistake, like his one friend (in front of me) in the beginning showed him a picture of condoms and said you should have used these or something like that, and I kind of just laughed and said it wasn't an accident dude... but my SO didn't even care to respond and I think he even found it kind of funny.   Well now 8 months pregnant on New Years <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> my SO made a Facebook status saying "Whoops" because he was lighting off fireworks and one went haywire and lit my dad's shirt on fire, it only lit for a second and then went right out yes my dad is okay, but my SOs other friend commented "6 months too late for that" on the Whoops status, like what? I went up to my SO and said you need to stand up for your daughter and I, and my SO just deleted the whole status and said that I was taking it too seriously,  am I nuts?? Like I'm pissed and want to write to this guy, first off I'm 8 months pregnant not 6 and second this wasn't an accident my SO wanted this too 😡😡😡 I feel like my SO never talks about me and his daughter or protects us 😭