I think it quite stifles discourse to require everyone to have done the exact same things as a person before commenting about a person. We don’t require you to kill a man before commenting about a murder. You don’t require someone to run for office before they are allowed to comment on a public official.

Good point, but that’s not what I did. I just responded in kind to someone using the absurd rhetoric that because Tesla’s cars supposedly can’t handle rain*, Elon is too incompetent to accomplish his goals re Mars. While we don’t [to quote you] “require everyone to have done the exact same things as a person before commenting about a person,” for certain arguments to carry any weight, the credibility of the person making them does, in fact, matter. If someone was criticizing Bjarne Stroustrup and how exceptions work in C++, but has never even written a single line of code in any systems language, it’d be completely reasonable to dismiss every single word out of that person’s mouth.

* Please note that I’ve driven a Tesla in rain just fine, but I’ll pretend the critique is legit and in good faith for the sake of the argument.

There are too many cars in this world.