Let me lay out why netdecking is not bad for you.
For that, first we have to look at the construct of "meta" -- "meta" is not a set of decks, it's a superset of the game, where decks that consistently win compete against each other. Where a certain deck excels at one specific aspect, it fails at another one, and it's up to the player to cover that weakness through either a) deck building or b) skill. Likewise, there is no "luck", just a set of probabilities in a deck -- netdecking reproduces not the skill of a player, it reproduces probabilities. It eradicates the process of finding strengths and weaknesses of a deck, and guarantees at least moderate success against other decks.
Any game will develop a meta game inherently, no matter what game, a "way the game is best played" or "how you can be good at it most of the time", and Yu-Gi-Oh! is no exception to this. Even if all new cards like Fusions, Synchros, Xyzs and Pendulums were removed from the game, a meta with the strongest and most consistent Effect Monsters would still form.
As such, the instances of this meta game can be plenty, be it Elemental Rulers, be it Shaddoll, be it Nekroz, be it Burning Abyss, my argument is still valid: netdecking does not reproduce skill.
Rather than letting the attitude of the players agitate you, improve from a loss and reform your deck if you're keen about building your own deck.
I necessitate you read this before you toss out arguments against me. My opinion on the matter stands.