I have been following the conspiracy theories as a hobby. Before I started to work from home, I employed this knowledge to make Trump supporters in the office go insane. I would just tell them one every time they brought up the hoax thing.
China rules the world. China started working on a virus that would only kill Asians. During it's development, it got loose. The plan was to release into Taiwan, Japan, SK, the usual suspects in SE Asia, then have the vaccination in it's back pocket. It got out too soon.
Janitor sells Wuhan bio-lab monkey or other animal to Wuhan wet market. To make extra cash, someone sold the animals they were testing to the wet market. Take it from there.
CDC closes biolab in bumfuck southern state for not being careful. This is a fact that the CDC did close the lab. China latches on and says that the virus escaped from that lab and has been in the US the whole time. They claim it was brought over when a military delegation from the US came to China for some big military meeting.
Canadian miscreant spy scientist. True, Canada did kick out a scientist that was a spy. Canada says that he stole virus samples from their lab, and took them to China, where they fucked up and let them loose.
It's been here all the time. China says that the genetic material of the virus is found in all the viruses that were going around the country this fall. They also claim that the vaping mystery illness and the kid sickness that we had that also was mystery was part of this. We let the CDC closed lab virus loose, then they say we exported it to China.
The other ones involve aliens, planetary alignments, comets exploding or currently due to enter the solar system, the new Atlas comet, Nirubu, and magnetism.
So when a Magamoron comes up and starts mouthing off, say yes! Then pick your theory, tie Trump to it and watch their eyes glaze over. Shuts them up every time.