You don't need to "welcome" either. You just don't talk about that stuff because it has zero relevance to your project, unless you're trying to use it as a political statement (which technical projects shouldn't be at all.)
Unless it is somehow very relevant to the project, I just don't want to know about anybody's race, gender, genitals, or politics. All those things can be weaponized to become divisive. I just want to work together with other people who are passionate about great technology.
This ‘don’t ask don’t’ tell stuff is regressive, but in discussions like this it sometimes seems to devolve into pure nonsense. No human community functions as you're suggesting. The literal content of what’s being said is so crazy that the subtext is clear: “if you’re not cis, white and hetero, then keep quiet about it”.
The thought of the average person having sex is repulsive to me. I don't want to know anything at all about it, especially if they're into weird stuff, but even if not.
Most people feel this way. Why is it so hard to understand?
Left to their own devices, people will talk about things that aren’t directly related to the project. How would you propose to stop them if not by enforcing certain conduct rules? You’re effectively just advocating for a different code of conduct, whose ban on all political discussions could also be portrayed in a rather Orwellian light by people opposed to it.