There's an overlap with climate change denial and transphobia. "We just need more data" is a common refrain used to argue for bans on adolescent gender transition, which then slides into arguments for why no one should be allowed to be transgender at any age. And it doesn't matter how many decades of data you have, how many anecdotal examples of you have, or how well you communicate your info; if someone's entrenched in their spot, they'll shrug: You have your facts, I have mine.