Trolls and cynics are the people who project their insecurities onto you. They don’t want you to succeed.
But then there is this other group of people which gives you harsh feedback, only because they care about you and want you to succeed. Their feedback takes your work to the next level altogether.
Cynics are easy to find.
The second group is not.
Find such people. And hold on to them. They are priceless.