I think it's just that most people who play multiplayer games aren't cut out for the entirety of what comes with playing them, especially team games. And games are more popular than ever so there's more people of all kinds, including the ones who can't handle things like communication without taking it personally or making it as such.
There is the psychological phenomena called the Dunning-Kruger effect. It can be basically stated if you don't know something, you also don't have the ability to recognize that you don't know it.
People believe their way is best even when they don't know what they are doing. So, whenever a player gives unwanted advice, there is a natural tendency to pushback against it even if the advice is correct.