The question of how to handle negative feedback online is one every artist who posts publicly will eventually face. Here's what I've learned from getting a lot of it.

First distinction: critical feedback about the work vs hostile comments about you. The first is potentially useful data. The second is noise. Learn to separate them quickly and route them to different mental processes.

For critical feedback: the default stance should be curiosity, not defensiveness. Ask yourself if the criticism identifies something real. If yes, it's a gift. If no, it's an opportunity to understand what the observer expected vs what you intended. Both outcomes are informative.

For hostile comments: close the browser tab. The quality of your work is not determined by the worst-faith reading of it.

The thing that most helped me: sharing work in communities with critique cultures before sharing in broader public spaces. Being critiqued by peers who want you to improve is a completely different experience from being commented on by strangers who don't.