For some guy's it's not about everything it's not their "life" it's their "hobby". Sound's to me like your a hunting snob which is right by those purist's. If he is wearing pink who care's it's his life and not your land. As long as someone doesn't litter or poach or destruct land we should try and unite and be friendly. Maybe he is new and dont know better or maybe he don't care and just like's getting away from his wife or kid's. Either way let him revel in his glory and use him to your advantage as other's said.
And look at chuck adams, fred bear, ted nugent,our grandparents,etc. They all killed numerous deer and other game in t-shirt and jeans, dont make it more complicated then it is.