Thanks guys for all your helpful support. It's ok, he finally left me alone now so it's all good. Yes it was just his presence that made me nervous. It all worked out fine. Thanks again.If it's embedded into their character and it's not a situational thing, it drives me completely up the wall. It actually makes me aggressive.
If it's situational, it depends. It might be endearing, slightly annoying, or I just never make contact with them.
With your ISTP person, is it his presence that makes you nervous?