This is really hard, and in the long run, how you respond may not have much impact on her relationship with this guy.
My teens know that we don't put up with disrespect in our house. I would probably approach it from that perspective. She's an adult and she's living in your house, mostly on your dime, so she can be pleasant or she can support herself. Frankly, I wouldn't put up with crap like that in my own home.
I would probably not harp on this guy. She already knows you don't like him and think he's bad news. I might try to have one calm discussion and explain why you are concerned (her safety, signs of abuse or overly controlling behavior on his part), but after that drop it. I'd let her know that if she ever felt in an unsafe situation, you would be there for her.
My sisters and I always joked that our mother would never give us a straight answer about any guy we dated. He could be Charlie Manson, and she'd say, "He seems nice, dear." I think she didn't want to make a guy more appealing because of parental disapproval.
My teens know that we don't put up with disrespect in our house. I would probably approach it from that perspective. She's an adult and she's living in your house, mostly on your dime, so she can be pleasant or she can support herself. Frankly, I wouldn't put up with crap like that in my own home.
I would probably not harp on this guy. She already knows you don't like him and think he's bad news. I might try to have one calm discussion and explain why you are concerned (her safety, signs of abuse or overly controlling behavior on his part), but after that drop it. I'd let her know that if she ever felt in an unsafe situation, you would be there for her.
My sisters and I always joked that our mother would never give us a straight answer about any guy we dated. He could be Charlie Manson, and she'd say, "He seems nice, dear." I think she didn't want to make a guy more appealing because of parental disapproval.