The message is not in the cartoon so much. It is in the curriculum that accompanies the cartoon. THAT is steeped in it. If that's okay to teach your kids then fine. Most parents don't want it taught to their child in school. I don't want my tax dollars used in this way.
Fair enough. I'd leave it up to the individual districts, though. If there are plans to show it in your district, then it's up to you to be involved to change things. If it is shown in another district, I'm not all that sure it's any business of yours or mine.
In that there are school districts where such material would be desired by the majority of teachers and parents, it doesn't bother me that such material is being made.