Yea it's bad but they are probably internet trolls that won't do anything irl or live on another continent. I get messages like that too.
Yeah, that seems more like troll shit. A guy into muscular women is more likely to invite her to beat him up.
I don't think they are trolls per se. Those are just very insecure and maladjusted people who see a strong woman and instantly feel the need to proclaim they could beat up that woman if they wanted to. Imagine how bad this must irk you to think its ok to speak to people like that. They should try telling that to someone in person and find out.
I know everyone flirts in different ways, but apparently, some guys are using this line to shoot their shot in cold calls.
I can’t say I recommend leading with that, but if the responses from other women on her post are genuine, that would mean a lot of guys are really into girls who can fight.