The difference is that it's an example of bigotry and bullying to challenge gender ideology. LGBTQ kids have an appallingly high level of suicide. The left wing objections are founded in reason, the right wing objections are founded in control and prejudice.

And actually there are a lot of laws against teaching CRT: https://www.forbes.com/sites/petergreene/2022/02/16/teacher-anti-crt-bills-coast-to-coast-a-state-by-state-guide/?sh=24d37ceb4ff6