As a self contained story i see the appeal, but despite her words being defensive and stuff, i can totally imagine some extrovert taking advantage of 'plain/pushover girls who have a hard time saying no' the same way some ppl are pressured to drink at drinking /after work parties lol
So they both have screws loose in their heads? Great! A (toxic) match made in heaven, I guess. Her cynical prickliness kinda reminded me of the girl from Kuga Tsuniya's Bruised Classmate for a bit.
So she didn't actually tell him he's wrong, or deny being an easy hookup. Yep, it's the usual fanbox porn ad.