Never, never read the comments section. People are idiots online. There's a type of misogyny online that I can barely wrap my head around (I deal with this stuff at work).
You can't control how other people treat you, you can only control your own behavior. My advice would be to ignore the daughter and the boyfriend, plus definitely the internet commenters.
As for what to do with the husband, that's up to you, but I think it will only get worse. He's not behaving the way a normal, non-abusive person would in this situation. A person with any sense would be mortified and doing anything in their power to deal with their rage issues. I worry that there could be more physical abuse in the future.