So I did a little research and I can’t really comprehend.
I cannot find any developer being just a little rude to you at all!
“Feel free to fork the module and customize it for your own needs.”
Only one developer suggesting (!) to you to make your own fork. While I think working with PR’s and improving the original module is better I guess you can just respect his view.
Sorry but we’re all at the beginning at some point (I am as well).
Pointing out someone as rude just because he is not interested in doing the work you suggested is a bit off.