I don't agree that a social phobia is rational. A fear of heights is rational, as if you fall, you'll die. A fear of social situations is irrational, unless you live in an environment where failure to adhere to their standards will end with you physically beaten. In most situations, people will forget about your gaffs after a short period of time.

And nah, I still disagree. I think people use phobia to mean irrational, so I don't want to use it unless I'm attempting to convey that meaning.