AIO Something A Friend did? NSFW?

Ok. I have this friend (male) who doesn’t know social Queues like normal people usually do. My sibling (female) wasn’t feeling well and this friend asked if they needed a hug. They said no and he grabs them and forces them in a hug. They tell me this and my blood just boils so a confront this friend and tell them basically to don’t do that and if they say no, don’t hug them.

For more context, I’m a senior in high school and was sexually assaulted so when someone gets touched in ways they don’t want to be touched, I get upset. Those kind of things trigger me and make me feel awful

My friend and sibling are also seniors btw

Should I tell someone or do I need to let it go?