Hate to think your caring enough to say something would be going wrong. You don't have to rave- can you say you look good or nice and still be sincere?
Welcome to our world. Where sadly for many of us it becomes a mindset. When basic communication can be tantamount to walking in a minefield, which can color your ability to communicate. So you become conditioned to saying less- not more.
I've had my share of such experiences with NT girlfriends that went WAY wrong. Though at the time neither of us were even aware I was on the spectrum.