He's just referring the "wannabes" who don't learn their instrument, don't practice ... and generally don't seem to care ... and end up wasting his time when they get into the studio ... so don't take it personally - he also rags on the "meathead wannabe" guitarists (like me! ) in another of his videos

On the "strings" issue though, I've got agree with him ... its not the top- or mid- or bottom-end that he's talking about, its the quality of the tone (of those top-, mid- and bottom-ends) ... a good set of new strings (or even re-conditioned ones) really do make a huge difference to the tone that you'll get out of your "stick" - whether its guitar OR bass