Was I too harsh with my brother for letting his girlfriend drink wine while 6 weeks pregnant?

So my brother posted a picture of him and his girlfriend on Snapchat and she was holding a glass of wine and I messaged him and this was his response

Then he blocked me on Snapchat so I messaged him on Facebook

Little back story he and his girlfriend have been dating 2 months today and she’s 6 possibly 7 weeks pregnant and she was talking about abortion once she found out and my brother didn’t agree blah blah blah they agreed to keep the baby and move in together and raise the child now he is TOTALLY mentally unstable and has always chosen his girlfriends over his family he a hot mess as are our parents but he decided to move to our dads when I was 12 and he was 16 so he ran away and has lived with him since I’m now 17 and he’s now 21 not to mention his girlfriend smokes weed as well was I too mean to him considering I’ve never been pregnant but I’m helping my grandmother raise my 2 year old cousin since he was a month so I know quite a bit about child care but considering his mental issues am I being too mean to him??