Straight men what would you do if your son started wearing makeup?

Even if he was straightStraight men what would you do if your son started wearing makeup?
Some of my best guy friends in high school wore make-up... i did make a rule that they couldn't put mascara on using the rear view mirror... they are all normal and sane... and two out of the three are married with kids...Straight men what would you do if your son started wearing makeup?
even if i wasn't pleased with it, it wouldnt be up to me it would be his choice not mine.