For the record, one could also just like a fictional story about a realistically-portrayed abusive relationship without needing help. Even in a "I wish that were me" way; one can have fantasies that would be bad to actually have enacted, and fiction is an obvious easy way to indulge them without actually endangering oneself or others. It's possible to have a bad relationship with fiction for sure, but people can have unhealthy relationships with squeaky-clean children's media; I don't think this is particularly irresponsible. It's also weird to see emotional masochism of all things getting singled out as a fetish to pathologize?
But yeah, that's also just not really the right reading of this anyways. This clearly is not a healthy relationship, and you could argue the constant demeaning is verbally abusive; but more than that, she's enabling the viewpoint character guy. Basically encouraging him not to change or get better because she likes him for the problems she points out. She wants him to stay the person she loves, even though that's absolutely not good for him. That's... not great, and I don't think it's a complete fairy tale, but it's not really the normal controlling, isolating, emotionally manipulating way.
After all, she's continually pointing out these problems (and in this one, 'problems'). Telling him not to fix them, but still pointing them out. That's not the best strategy if you want to manipulate him into continuing the problems; though of course not mutually exclusive, if she just values being able to do the demeaning enough.
I just think it's neat and interesting, and because these people do not exist and I am normal, I don't feel guilty for that interest. I guess being a masochist helps in finding the dialogue entertaining, though I'm not projecting onto Mr. Protagonist Guy here and do try to make my life better.
If you're reading this and it makes you uncomfortable, I'm not going to tell you to stop, do as you like; but like... why? I don't think this is really teaching anything. Maybe I just don't fully appreciate the appeal of reading something that is fascinatingly frustrating or miserable? Wait shit am I not an M