Last time I had some free software actively out there, I got that several times.
My response was "So if I follow your demands you'll stick around and maybe demand more, of I tell you to get stuffed you'll go away and bother someone else? In that case: feel free to get stuffed."
Some just went away, I got one "I'll make it so you'll never work in the industry again!", and one started to beg profusely that I implement what he wanted because he would lose his job without it (not sure how that worked, I assume completely made up, didn't care either way).
Of course that was long before current social media outlets made it relatively easy to create a made up shit-storm, I might be a bit more diplomatic (but no less definite) in the same position these days.
My response was "So if I follow your demands you'll stick around and maybe demand more, of I tell you to get stuffed you'll go away and bother someone else? In that case: feel free to get stuffed."
Some just went away, I got one "I'll make it so you'll never work in the industry again!", and one started to beg profusely that I implement what he wanted because he would lose his job without it (not sure how that worked, I assume completely made up, didn't care either way).
Of course that was long before current social media outlets made it relatively easy to create a made up shit-storm, I might be a bit more diplomatic (but no less definite) in the same position these days.