The person telling you no isnt saying you are a shit person, it means they aren’t interested in you. You’ve surely met women you aren’t interested in right? You would be right to tell them no if they asked you out, as the alternative is lieing and misleading, and will cause pain in most cases.
Its okay for someone not to be interested in you. Breath a little, step back and calm down. Its like some version of main character syndrome.
Also, I would consider it a huge red flag if someone had such a negative reaction to being told no when asking someone out. It implies there is a lack of confidence and self assuredness that is a base requirement to be in healthy relationship. We all know women are very careful of red flags and share them with each other as well so this can be self defeating.
If you want to find someone to be with, then you need to figure out how to properly treat someone like an equal, which includes respecting both yourself and them enough to prevent a negative reaction to simply being told you aren’t a persons preference.
Women share things like this with each other to keep each other safe in most cases. It can seem cruel but if a girl feels like the way you reacted to rejection was bad enough it was a red flag, then they have every right to share that with their social network.
All it takes is some self awareness and acceptance of your own mistakes and they will quickly change their tune though. Humility is very important especially from a mans perspective towards women.