Hm, well, I am one of the people who have the 'privilege' to label themselves as having a "Social Anxiety Disorder".
(or at least, I think so, but the term we use here would be more accurately translated to "Social Skill Disorder")
It came with something called PDDNOS*, and it's quite annoying sometimes, although it has it's advantages.
It goes as far as that I sometimes don't even dare to ask my parents for, let's say, the peanut butter on the other side of the table.
Calling or mailing people is also pretty much out of the question. If I am somehow forced to call, mail or ask something to someone, I usually simply "block" (don't hear, see, feel or move and ignore everything) but in extreme cases, I might black out(as in fainting) or lose control (start crying and such) the last two are useually followed by several restless nights. (and the resulting bad temper

)
I think it's pretty ignorant to say something like that isn't a disorder, but if you're only a bit shy... Well, in that case I agree with most posters above me.
*Pervasive Developmental Disorder not otherwise Specified