Homosexuals are not against Uyghurs. If someone is against homosexuals, then fuck them. Regardless of where they are from.
If someone leaves because of seeing the Uyghur flag, then good riddance.
If someone leaves because of seeing the rainbow flag, then good riddance. If someone leaves because of seeing the Tiber flag, then good riddance.

It doesn’t look like the instance suddenly lost any notable part of its active users. After all, there are very few assholes on this instance. And if some left now, all the easier for the moderators.

In any case, staying neutral in the face of human suffering is against what makes us human. If we did that, we wouldn’t be full-fledged humans.