i) Nothing about the joke is homophobic.

ii) I learned something, but perhaps not what you wish I'd learned.

iii) I don't care if you think I'm gay, partly because I wouldn't care if I were gay or not, but mostly because I don't care what strangers think at all.

iv) My jokes are no more or less funny depending on the sexuality of the teller.

v) I generally don't have any problem with anything anybody thinks or says, though political winds in other countries are starting to concern me a bit, Canada's pronoun law for example. So long as we're only talking and nobody's going to jail for wrongspeak, I think there's no problem.