It's also bitch picking and lack of authoritativeness
I don't really see that too often

Only like, retarded teenagers who are like "oh yeah the blues are this" and play some minor pentatonic bullshit, ignoring the fact that 90% of the blues is major pentatonic lol
But even then that's because they are playing the wrong scales, not because they can't even get the basics of the technique right
The youtube thing (see, marty above, robert baker, phil mcknight, glenn fricker) is way, way more common to see with grown adults. I think it's because teenagers are more likely to underestimate blues, and adults are more likely to underestimate metal