My sister’s boyfriend sucks

No one likes him. He treats her like garbage and he’s just an overall asshole.

A little over a year ago during a family vacation, they had a bunch of drama. He wouldn’t give her a key to the hotel room and basically told her she needed to find her way home (to a different state and he wouldn’t give her the flight info either)

My husband and my other sister’s husband both went to the hotel to get her stuff so she could stay with us. He basically threatened both of our husbands and tried to fight them.

Since then, we’ve all avoided spending time with her. She lives in another state, so it hasn’t been that hard, but she keeps asking when we’re going to come visit. I just ignore it and talk about something else.

On one hand, I feel like an asshole avoiding the subject. On the other hand, I feel like I’ll be an asshole if I say I don’t want to visit because of her boyfriend as it will likely cause drama for her. She also has a 3-year-old (not with him) that I don’t ever see because of this…

What should I do? Should I visit and pretend I don’t hate her boyfriend? Should I tell her I don’t want to visit because of him? Or should I just keep avoiding the subject?