Earlier quoted context omitted.
That depends on what you consider feedback. In this case, the "feedback" was: 'you are a faggot. this facebook sucks. the one should come back. i want to kill you. go fuck a man'. I kid you not. Do you think people (any people, nevermind those who build products that are given away for free) deserve such abuse?
These people deserve to be treated with the same courtesy, dignity, and respect as everyone else. You would be surprised to see how people change when they get a nice response from a human.
I do, however, agree with you. As I mentioned in the note, I did spend a lot of time responding courteously to a great deal of personal user feedback. Having invested significant time doing so, I know and fully appreciate the difference it makes. I am also personally appreciative when I am on the receiving end -- I enjoy the thoughtful personal feedback people take the time to send me, even if it is critical.
I only responded in this manner to the most intensely offensive and bigoted messages received. I was sent thousands of personal messages in the span of a few days, a pretty good portion of which suggested I should die.
I also agree with diN0bot. The professional decision is to simply ignore personal attacks in a professional context. In this case I can ask forgiveness for a momentary lapse, call attention to the tricky distinction between personal and professional contexts on Facebook, and chalk some of this behavior up to stress relief during a period of highly intense work.