To enjoy truly enjoy Dota, I mean, to log in, play a match and have a good time, you need to learn to not care about what people say.

The game as matchmaking. This means terrible players will be matched with other terrible players and tryhard semi-pros will fight other tryhards.

But no matter your bracket, everybody is a walking encyclopedia of gaming knowledge who know better than you how you should play.

So take what people say with a grain of salt. If he was that much better at you at the game he won't be matched with you.