I wrote to him asking if he had any feedback on my project, since I'm about to release it, and because he had a similar project that didn't get much traction. He didn't reply...fair enough, I'm sure he's a very busy guy.
Fast forward a few months, I launch the project and it blows up on HN for a few days, and on twitter for a few weeks. The majority of people love it! But sifting through the feedback online, I'm shocked and disappointed to see is the very person I reached out to trashing my project publicly in comment sections and on his twitter feed. No constructive feedback, only how the project itself was a horrible idea, and the code was disgusting. I was dumbfounded...before, I wasn't worth 2 minutes to reply to in an email, but now I am worth destructive criticism on social media by the same person?
I waited a few months and sent another email asking for advice on maintaining the project. No response still. Yet every now and then, to this day, I still see backhanded comments by him about my project whenever someone mentions it to him on twitter.
Some people are toxic, petty, and childish. I don't really have a lesson from this, but that's my little story.