I think people are frustrated with the firehose of whataboutism rather than disagreeing with you with the idea that things are not perfect.
Whataboutism, used effectively, is meant to draw parallels rather than excuse behavior. Fuck China for what it's doing here, but also fuck the countries and entities who have used similar tactics in the past to great effect. Don't just conveniently put on blinders for what's happening/happened at home all because the government-labelled "baddie" did it too.