I can follow his line of thinking. I have a friend who's a giant scrub. He'll blame his loss on some kind of cheapness of the opponent 99 % of the time. He'll make up a new excuse every single round if you try to be versatile. He hates me for playing Ike in Super Smash Bros. even though I play him out of personal preference and he happens to be low tier
, and I wonder why he continues to play Captain Falcon if he thinks he's not as good as my character. He rage-quits in Starcraft II right away if he gets canon rushed, even if he has an ample chance of winning against it. I have nothing against canon rushing. I don't like doing it myself, and suck at it, but it's clear that Blizzard intended it to be a thing you can do in the game. I have no qualms with people that use it, and I have nobody to blame for myself for sucking at countering it when I lose to it.
I do agree that in all GOOD competitive games, there's no such thing as a tactic cheap enough that you can't counter it and turn their cheapness against them.
On the other hand, I think we're all scrubs one way or another. It's pretty much guarenteed to happen when you're bad or new at something. No one, ever, wants to admit that they suck. I pulled out all the examples of my non-scrubness above, but I also have more suppressed memories of major scrubness: I spend all my time complaining when playing FPS games. In TF2 I'm always playing against the overpowered classes or running into the one who's the paper to my rock. Or so I tell myself and others. There was several tactics I considered cheap in the first Starcraft and Super Smash Bros. Melee. And so forth. Scrubness is more a phase than a state, I think. It may help to get you through it by being conscious of it, but you have to get through regardless.