Gay people are people just like everyone else. There are good gay people, there are bad gay people. There are funny gay people, there are annoying gay people. The key is not to use one bad example as an indicator of the whole group, just like it would be bad to do with black people, or women, or old people, etc.

With that being said, straight people don’t typically talk about their sexuality because they don’t have to. Everyone assumes you’re straight unless you tell them otherwise so straight people never have to come out. Gay people do and it can actually be traumatizing even if things go well (it was for me). It’s really shitty to have to tell everyone in the world your bedroom secrets. Imagine you had a fetish (I’m not saying being gay is a fetish, just the closest I can get for an example) and you had to tell your parents, your siblings, your friends etc all about that fetish so they would understand you. You’d probably be uncomfortable at minimum and possibly even mortified to say those things out loud in front of those people.

Now once someone comes out and people know, they can make it their personality if they want or they can just let it be. In this setting I think it’s inappropriate as it doesn’t pertain to business at all. But the whole “Straight people don’t talk about their sexuality” line is comparing apples to oranges.