As long as male, female, and transgender aren't political parties I can't see how this would fit either a propaganda or a political statement tag. If that same statement would have been made by a political figure or mascot I'd probably let it slide under political statement, but I'm unaware of any party using a unicorn as mascot.

This would be much easier to deal with if we had tags that couldn't be placed by member rank accounts.

Controversial_opinion would probably the best fitting blanket tag, but has quite a potential to be abused, even with tag locking in place.

Offensive_content wouldn't work by default because rape, snuff, cub porn, scat, and watersports content exist. Offensive_opinion might also work as a tag, but has the abuse potential as controversial_opinion.