"typically have a talent that others are jealous of": This is truly a problem not just for the gifted but often for anyone who actually gives a shit.

Another consideration is that often when you are helping someone get what they want, they can feel inferior and/or powerless (i.e they are not programmers, tech is a black hole to them etc). On top of that often internally they feel unworthy and so strike out at the very person helping their success. Weird but it's happened to me.