How would you feel/deal with this??

So Saturday was my fiancé’s brother’s wedding. After the reception everyone (the family of the groom and bride) were taking pictures outside. I was sitting pretty far away from where they were. I was talking to my fiancé’s brother in law. When my fiancé’s other child ( previous relationship) tripped on a cord and fell. He was running around but he wasn’t paying attention because he had his face in the iPad. Everyone rushed over to him and helped him up. My fiancé’s brother in law and I walked over to see if he was okay. Then suddenly my fiancé’s 2 sisters, his mom, and one of his nieces started saying stuff along the lines of “ wow you’re such a fucking bitch, how would you like it if that happened to Mila (my daughter), wtf is wrong with you. “ I was honestly confused because I really didn’t think I did anything wrong. I said back to them “ first of all this wouldn’t have happened to Mila because she would be taken care of properly and not be running around with her face in the iPad, 2nd of all I have no idea why it’s my fault. I did not trip him or anything I wasn’t even close to him. And 3rd of all there’s a reason why on the invitation it says not kids allowed. Hence why mila is not here.” I walked off pasted the parking lot and I was gonna call myself an Uber. I was standing in the cold for 15-20 minutes. My fiancé did not say anything to them for speaking to me that way for no reason. He didn’t even bother to follow after me or try to talk to me. So I ended up calling my sister to pick me up because my fiancé had my card and I needed the info. She picked me up and brought me home. I told the baby sitter she could go and my fiancé didn’t come home until almost 3 am. I told him I don’t want NONE of them at Mila’s Baptism, her birthday party, nothing! I told them if they come to my home I will call the police because they are not welcomed. I am pregnant with my second and I don’t plan on letting them be around he or she. I don’t know how to feel or what to do about it