I feel like it depends, I think a lot of people saying “kids are much more accepting of others than adults” were talking about how kids are more supportive of the LGBT community. But, they’re many ways to be “different”.
Some kids at schools, are not very accepting of autistic kids, and other kids with Disabilities. I’ve seen this happen before myself. So it depends on what you mean
I actually don’t think kids are more accepting of other people than adults. Kids and especially teenagers are not accepting if you’re even a tiny bit different than them. It’s mostly because we’re immature. Adults are extremely accepting in my experience.