Rainbows were commonplace on everything related to kids; always on their toys, one of the first things they learn to draw to help understand the colour spectrum. They've been strongly featured in both children's films and books, as well as usually found on some charities' logos.
The hijacking of the rainbow on behalf of the progressives has probably been done subliminally to psyop kids towards it.
I had a similar experience in 1999 when I said that I liked the Rainbow Badge from Celedon City in Pokémon Blue, because I also liked Erika, the gym leader. My sister came over to me and told me to be careful with rainbows because it was associated with gays. It's like you can't even enjoy a rainbow now, and I have to be careful when buying clothing, toys, and accessories for my kids due to the perversion of the rainbow.