One of the tobacconists I frequent carries glass pipes, and all other things associated with a head shop, but it mainly sells pipe tobacco, pipes, RYO cigarette supplies, cigars, and has a cigar lounge. They cater to all types of smokers. While in the shop the staff waits on pipe smokers and pot smokers and it doesn't bother me. I don't worry about what other people think I might be doing, and if they really want to know I'll show them my pipes and tobacco and share any information about it they might want to know. Of course In Washington (State) and Oregon, marijuana use is so common now that no one really reacts to it anymore.
If you want to smoke a pipe then smoke a pipe and enjoy it. Don't worry about what others might think of it.