I have to admit, probably all of the T-shirts I own (just in general) were being sold in the men's section of one store or another. The way most stores around here are set up, you'd think that girls are only interested in things with sequins or neon pink. All the fun stuff that isn't obviously feminine goes straight to the men's section. I've had people comment on "fun shirts" before, but never in a disparaging way; actually half the time it's "oh hey I love that show!" I think a lot of people are just curious when they see a girl or woman who is willing to wear something related to what they like.