I've seen a bit of the fallout on weibo, and honestly, I thought that most of the fans didn't care that Bright has a girlfriend. Most are angry about the covid-19 retweeting since it is still a very raw and fresh wound to the Chinese people. Fans were waiting for Bright to say something, they didn't blame him for his girlfriend's actions, but he instead liked two tweets/comments on ig (can't remember) that was more about his fans trying to break up his relationship.
Also, ching chong is, if not outright racist, a very derogatory term to refer to the Chinese. Fans felt that as Win had studied in the States as a foreign exchange student, he should have known better, even if his friends meant it as a ~joke. Also, Win actually did apologize on weibo for liking the comment and that he didn't mean any harm.
Although there are a lot of angry people right now, I want to say that there are also a lot that are hurt, upset, and disappointed by what's unfolding. It's very sad when I look at the 2gether the series tag on weibo, before everyone was happily talking about Sarawat and Tine, and now people are just very hurt by all that's happened and leaving the fandom. Tensions are still running really high at the moment, so hopefully everyone and all sides will stop with the racist attacks and all the fighting soon because that won't do anything for the matter.