That's nothing - I had an interview with them in their early days, and showed them my idea for a one click button. Never heard back from them - wonder if they used it?
Got to be honest, from personal experience on github and sourceforge, I have found that some people will not take polite feedback, they will not listen, they will not be reasonable, and they will suck all your energy - if you let them.
Basically ignore and block the time sinks as soon as possible. And don't feel bad about it - you would quickly remove a tick, mosquito, leech or other parasite from yourself, remove them equally swiftly from your workflow.