Hiya mate! The deviancy isn't homosexuality, which any sensible fair-minded person has long accepted to be fine (i.e. not a deviance). The deviancy is sticking inanimate objects in one's arse for sexual arousal. That's not generally universally-accepted as a normal sexual act. That Elon interpreted the diver's stick the sub up yer arse comment to mean something sexual shows he's possibly familiar with literally doing such things in a sexual manner...a bit deviant: departing from usual or accepted standards, especially in social or sexual behaviour.
The diver obviously meant get lost. The joke is Elon took it to mean something sexual: "he suggested I engage in a sexual act with the mini-sub" - that's not homosexual, that's sexual deviancy: Sexual excitement to the point of erection and/or orgasm, when the object of that excitement is considered abnormal in the context of the learned societal norms (paraphilia).
Elon can still do whatever pleases him, that's why I also wrote "each to their own". But if he reveals it in public (especially while calling a hero a pedo for no reason) then he leaves himself open to public mocking.
Three things:
1 - using your own logic, you shove inanimate objects in your ass for sexual arousal.
2 - you can't have it both ways. You either take the comments at face value, or you take them at their fully intended meaning.
3 - it really isn't a deviancy anymore (within reason). Unless you are an ultra conservative, and even then, they do it anyway.