Part of the problem is seeing homophobia as some core value that each person does or does not hold.
A great many people won’t have it as a core value. And then their first major engagement with the topic is that it is introduced to them in this very negative way through no outsiders and they shift to a somewhat homophobic position.
Perhaps no outsiders isn’t revealing homophobia but creating it.
The whole notion that we teach children the equality act is worrying. There are very few topics where we teach children you must hold x opinion because that is the law, especially if this is their introduction to the topic.
And that is written into the content of the lesson plans, regardless of cute polar bears or however they are trying to spin it in the media.