Ah, yes. I have pondered that question many times.
In our society it is harder and harder to have "people skills", i.e. to remain patient and polite in the face of pathologic, malicious idiots.
Although these jobs probably do not meet the requirements OP listed, these three are potentially useful to look at for someone who lost their job because of interaction with others:
Military. US or foreign (Foreign Legion) offers many training programs that deal with gadgets. Also, if you like the idea of shooting people, nothing beats the military - and you get paid for it, and with nice benefits too.
Truckdriver. You are in your cab away from people, get to listen to music of any kind and at any volume, and text while you work, not to mention watch porn or play with the CB radio, all without ever being seen.
Corrections officer. Good pay, and a very solid job security. Can be a little dangerous, but you definitely don't have to smile and fake happiness.