What do you guys think about this 30|0 game I played today?

Pay no attention to opponents like that.

Your opponent has only played one blitz game. How would he know what to expect?

At any rate, you played well.

I guess you're right.

I didn't want him to leave wrongly thinking that I'm a cheater, so I tried to convince/prove to him that it wasn't the case but he had already left before he saw my message and blocked me afterwards

Blocking you after saying something like that is pretty clear proof that your opponent is a troll.

The best thing to do is ignore it.

you shouldnt be surprised at the accusation in spite of your opponent dropping a piece early, due to the 835 rating after numerous games.

Frankly, your opponent wasn't good.

You were won by move 17.

by move 13  that game was over  you played well and he played... not so well