Well, on VM are crap, I can say on one hand yes, but on the other no. Can you do a true bare metal test and say it is OK for everybody? No.
You’re using an Intel CPU? AMD users will tell you “what about us?”
You’re using an AMD GPU / card? Nvidia and Intel users will tell you “what about us?”
The same for SSD and HDD users, every brand of network chipset too. If you want to do true bare metal tests, you’ll need at least a dozen computers.
If you want to show some CLI tricks to manage files, a virtual machine is as good a bare metal one. If you want to show package management too. I just can stand useless comments as: “only bare metal videos can be trust”.
Indeed, it is known that a package manager will not behave the same way on VM and bare metal 
The worst of some people or what they really are? Well, I don’t know. Do you have an answer here?
@Bryanpwo: thanks for the threads merge, I was looking for it!