Not just the gay men. I'm straight and in my 40's and I've got a drawer full of boxer shorts emblazoned with Scooby Doo, Horton (as in "...Hears a Who"), Tigger, Dilbert, etc.
And the last time I went to the grocery store, I bought the Spongebob Squarepants variety of the Kraft Macaroni and Cheese just for laughs.