I've built https://pyup.io/ a couple of years ago and I just stumbled upon a post on reddit I made when I launched the service.
The post had zero upvotes and two comments:
what a terrible idea
This truly is a terrible idea...and it's super over engineered for what it does anyway....and it's a service?! How do I down vote the whole idea.
It was a horrible feeling to get this kind of feedback. I felt worthless, like a failure. All I had dreamed of and worked so hard for suddenly collapsed in front of my eyes. I was about to throw all of it away and build something new. The day I launched I had zero signups, it was absolutely horrible.
But when I woke up on the next day I said to myself that I won't listen to these guys. That the service I'm building is valuable. That the idea is in fact great and that I believe in myself.
I used the negative feedback to push myself even harder. To prove them wrong.
Fast-forward, the service is now used by giants like Google, Intel and mozilla. It is profitable and I just saw a fellow Indiehacker @karolina who launched with a similar idea.
Listen to feedback, but don't let overly negative feedback bring you down. If you believe in your idea, stick to it. Refine, adapt, transform it. But don't let a couple of trolls on the internet bring you down.