It has happened to me a few times, usually done by drunk women. I think most of us expect it, unfortunately, since the kilt does attract attention.

I would guess since you are in a really nasty place right now your comrade "flipped you off" more as a stress reliever than anything. I'm sure your 1SG noticed and will deal with it.

Always have a good supply of comments waiting for the next time someone does it.

Stay safe!