As a tactile person myself, who by upbringing does hug/kiss naturally, I actually totally agree with all PPs finding assumed attention an invasion.
Thoughtful 'huggers' surely become adept at reading body language, and refrain accordingly.
Clearly all the more so if keeping your distance has been verbalised in no uncertain terms!
It always amazes me that some are so selfish as to feel they have more of a 'right' to hug & kiss, despite having been given a big red flag not to by someone else.
I've been told (on separate occasions by different people) "Actually, I'd rather you didn't" / "Please don't hug me, I really don't like all that" etc., and just taken that on board from then on in, no fuss or awkwardness from either side.
(To dismiss that as 'uptight'/ 'cold'...that's plain offensive 
I'm really cross on your behalf!).
Because why wouldn't anyone with an ounce of sense consider other people's preferences?
(Particularly good points upthread re sensory and pain issues making touch unbearable, too.
Some who've no idea how shit that must be need to take heed).
Interested to hear how it all works in cultures where overt physical greetings between anyone and everyone, including business associates, is the social norm, universally regarded as breaking down barriers etc.