I would expect a joke that revolved around dad referencing sex with mom (or their sexuality at all) would also get removed.

Where in the OP does it talk about having sex?

Why don’t you have a problem with “bisexual” not being considered “gay”? Because you’ve decided that’s okay. And I don’t disagree necessarily, because for example we have LGBTQ+ which separates out the letters. But if you reduce that to a single word, it would probably be “gay”, meaning that bisexuality is also gay.

This has nothing to do with this post. To clarify though, I’m a bisexual woman. Sometimes I call myself gay, but it’s not quite the right term. And you don’t get to dictate what someone identifies as for their sexual orientation.

There is nothing inherently sexual about the original post.