I think he's more concerned for your safety and he might be a little embarrassed b/c it's a bit of a shock to his system. Try wearing it to somewhere where he and you will be in a 'crowd' the first time you wear it around him (a party perhaps?). Once he sees the positive attention from the ladies and the positive comments from random guys, he'll turn his opinion around.

The First places I wore mine around my friend Steve was up in Bath PA (VERY redneck) to a bar. I had a spare kilt in the car, but my friend REFUSED to wear it and begrudginly sat beside me in 'my skirt'. After we were in the bar for 15 minutes and were approached by a GROUP of women out at a bachalorette party, he quickly changed his mind and begged me to run out the car to get changed into the other kilt. Funny how that works.