Was I wrong to protect my child from this?

I have an 8 year old daughter. I also have a boyfriend of five years that she considers her dad. He is very loving and sweet with her usually, but today something crazy happened. His younger sister and her husband were sitting on a couch in their parents living room. They have hardwood floors which were previously scratched because they slide the couch all the time to get in the closet. His parents showed my daughter a while back how to move the couch so she can get her art bag out of the closet when she is over. So my daughter goes downsatirs and tries to move the couch with the sister and husband sitting on it. All of a sudden these two start yelling at her to stop. She asks them to get up so she can move the couch. Instead of asking her why, his brother in law says "no I will not move and you need a hobby. Go sit down right there on the carpet." So my child is looking at them and then his two sisters start yelling at her also. Now there is three ppl yelling at her to stop and telling her that she is scratching up the floor. So im in the kitchen and I hear all of this so I walk in and my bf comes from the hall and starts yelling at her too! So I look at all of them and say " You guys she always moves this couch so that she can get her things out of that closet, the floor was already scratched before this" So they are all still yelling and finally I look at my bf and say " this is the only time i will say this. stop yelling at my effin kid. she is trying to get soemthing and none of you guys thought to ask what or why was she doing it. Just start yelling at her.! " My bf says I need to chill out and lower my voice while talking to him and I tell him to eff off. He just let them jump on her like a pack of wild hyenas and didnt come in to mediate the situation but to yell at her too. i don't want my child to be sensitive and I also think they owe her an apology. So i grabbed my things and left without saying goodbye. Am i wrong for protecting my cub?