What mecha story has gay shit? I’d like to watch it.

The most popular recent one is Brave Bang Bravern.

Keep in mind Japan has heavy censorship so a lot of the “gay mechas” are implied and subversive theming instead of openly gay.

Squid in a schoolgirls ass is just fine and dandy but heaven forbid someone is gay.
Censorship rules always end up stupid because individual morality isn’t consistent and blacklists are never comprehensive
Well yeah, someone has to think of the children (and their apparent love of tentacles that is only matched by the intensity of their homophobia).