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This has been studied for decades. The number of people who have had some kind of sexual experience with the opposite sex is far higher than many expect. I recommend doing some more reading on this subject before coming to the (ridiculous) conclusion that people are claiming to be bisexual because they somehow enjoy feeling oppressed. https://kinseyinstitute.org/research/publications/historical...
Teenagers have always pushed against the prevailing narrative, it's how we get new ideas into the world. It becomes problematic when viral vectors of trends are disseminated at the speed of thought globally. Humans aren't hardwired for this. See also the recent HN post that more teens are depressed than ever. It has nothing to do with actual geopolitics: remember that the Cold War was extremely bleak for Americans and go back just a little earlier and you have World War II and the Great Depression.