The root of it is transphobia because before the Olympics started, they predicted that because trans athletes are allowed like they have been for over 20 years, they’ll dominate every event despite that not happening before and nothing having changed recently. Since that didn’t happen, because admitting that they were wrong is very clearly not an option, they accuse cis athletes that they deem not sufficiently feminine of being trans. People who don’t really follow what’s going on but take the right wing position by default believe them, and it reinforces their biases, so it works as propaganda despite a complete lack of basis in reality.