First of all, it’s a Pixar movie. Second of all - if they’re transgender, you miiiight rethink using “a male styling himself as a female” to describe them. Third - I also don’t think this was by design. It’s more likely that they chose those bugs because they looked nice, rather than trying to sneak in some LGBT themes, especially considering the time the movie was made and what kind of awareness there was on the topic back then (there wasn’t a lot).

But anyway, I wouldn’t say a queer reading of anything would really constitute learning something new about a film to me personally - it’s just looking at it from a different angle. That said, it is always surprising when the creator steps out to announce something about the work that wasn’t part of the original text. Like you can try to argue it was foreshadowed in extremely subtle ways, but Dumbledore being gay came completely out of left field.