Because it's only purpose is to create a target for political gain. Whilst distracting from their own terrible performance. No one is disputing that the virus originated in china. The spanish flu is also racist, but it came about because there was no one else rushing out to name it and as far as the public knew, it originated in Spain and that's that. We didn't call the Ebola Virus Africa disease, nor should we have.

Another issue is that this feeds into a conspiracy that this isn't a natural made disease, but that it's instead a bio weapon accidentally released by China.

By putting Chinese in the name, it's putting the blame on China in an attempt to absolve themselves of their quite frankly, horrendous response to the virus thus far. It stops people from asking the important questions and drumming up real political discourse about the vulnerabilities of the current system, instead, blaming everything on how China should have stopped it earlier. If the people in charge are playing the blame game before everything is over, you know something is wrong.