Usually when girls talk about stuff like this they are really over reacting and getting wound up over nothing. You, as most people seem to have pointed out, aren't one of these girls. He really does sound like an arse.
If you haven't told him that it does upset you then he might actually just be trying to make the relationship open and relaxed, and he might not be telling you that you look good because he assumes you already know. However he is still acting like a bit of a knob.
Instead of telling him this (which he may well just interpret as stereotypical girly nagging), it might be worth seeing if you can do the same to him - that way he might figure out that he's being an arse without you needing to complain at him for it!