Whenever I use gay, I usually use it to mean "corny." I actually have never had a person tell me to stop using it in that context, even when I use it around people who I have heard talk to people about how they shouldn't use that word. I guess it sounds a little less offensive in that context.
I don't really mind it, although sometimes people just say the word so... forcefully and passionately. I also hate it when someone says a sentence and they obviously mean it to be funny because of their "comical" use of the word gay.