Because had the Chinese government acknowledged the Wuhan outbreak early, and done a local lockdown instead of trying to shove it under the rug, there would be no pandemic. Quite a reason to be pissed off at it (mind you, specific government and not an abstract "race").
You will notice that most of those names don't come from people living in that place and frequently those diseases were actively named to denigrate the locals.
Or they're not named in recent times, but instead in times when using slurs was a leisure activity.
Plus the egregious case of the "Spanish" flu that might have originated in the US but Spain was unlucky to be talking openly about it.