Trust me, I’ve been playing guitar my whole life and professionally since college. Cats who can REALLY play at a high level would never put down a beginner. and they are almost always open with their knowledge. They don’t have to tell you how great they are, because their music does that for them. This dude ain’t shit. I’d just focus on your own progress and don’t pay his comments any mind. Make your sword a little sharper each day and you’ll be playing circles around Mr. know it all.