I think your attitude is pretty lazy. It's a low-effort answer to say "skill issue" and then walk away feeling superior. Much harder to lean in to the other person, understand them, then help guide them onto the path. When you do this, you cause them to accelerate tremendously.
IMHO as you get more senior in software, after a while the only interesting metric becomes: are you raising the level of the people around you?
EDIT: looking at your Github seems like you are still in university. So I'll say "age and experience issue" on your end ;)