It does sound like he's ignoring you. So what? He's trying to punish you for speaking your mind. Don't fall for it. Telling him that you don't want to see him naked is a reasonable request. Next time he brings up the bit about the nudist colony tell by all means to go there. It's appropriate to be nude at a nudist colony. It's NOT appropriate to be naked in the presence of anyone who does not want to be a round a nude person.

I would get majorly creeped out if my brother decided to parade around naked in front of me. we're not in a locker room dammit!

Just a thought next to time he pulls that pop his a@@ real good with a rolled up towel. That smarts