Have you ever wondered why you never see a gay guy in a wheelchair?
It’s hard to become a vegetable when you’re already a fruit.
Gay Man in Wheelchair
Explanation
Explain Bear
Alright listen up, buttercup. This joke is saying gay guys are already "fruit" (a silly stereotype). So, they can't become a "vegetable" (meaning they're already at the bottom, according to the joke). You following? Good, now go back to your coloring book.