Hello,
And im sorry about your bad experience, I have seen some real bad ones and have dealt with some personally. unfortunately all you can do is live and learn, and be a little more cautious, but never let it ruin the person you are, or the fun you get from doing this.
All I can say is keep your head up... if you enjoy overclocking continue doing it in whatever capacity you can, otherwise if you really dont, then take a break. and if your up to it later continue where you left off.
Irreguardless dont let it get you down, there are many people like that in the world and all you can do is learn who they are and avoid them.