I'm a harem writer, so I get a lot of negative reviews, simply because I tagged my work as harem. Well, I do understand their saltiness, which I try to rectify on my novel. However, since many would have an immediate bias on my chosen genre, many would drop and diss it even before I/they made it to the parts where I did the divergence on the common tropes.
Which is fine by me, by the way.
In any case, I deal with bad feedback/comments/reviews by picking up on the things I needed. See, even before I wrote my work's first chapter, I already planned it way to the end. So, in my perspective, it's a 'finished' work. As such, I only choose what's relevant to improving my narration, and other aspects of the story, rather than to listen to others' saltiness (I throw away/ignore/delete useless feedback). Well, most of the negative comments I received often pertain to the apparent 'plot holes', which is actually, if they only read the entire chapter, they'd knew that there's no plot hole.
Or, for them, the motivations behind a character's action are too 'shallow'. And the parts they're complaining about are actually normal in my culture's set of traditions, customs and beliefs. I guess everyone's entitled to their own opinion.
Or, like I always tell the SH denizens, there's this one time I received a 0.5 star on RoyalRoad simply because some Melvin Wong (whoever the fuck he is) wanted sex in my story, and I won't let him have it.
Another way of dealing with negative reviews (especially if those revs are irrelevant to my plans to my story), is to remove my story from the site and just focus on where it's received well. It's just like 'choosing your battles'; it might seem to be shying away from the challenge, but it's really not. For me, it's only choosing those who are really interested in my work, so in case they found some glaring errors in my story, they'd take time to give me sound advice, rather than an entire article of saltiness (and pointless name-calling).
For example, here in ScribbleHub, a lot of users hated the harem genre. I write harem, so when I removed my work (due to an entirely different reason), I resolved not to upload it here anymore. But I did upload another story (non-harem), and it's received well.