u/HAHAREDDITGOESBRRR

Not sure if the Subreddit is the right one here, but tonight I went to my LGS, bringing all my Decks (Bracket 2, 3 and 5, the latter being Codie, Vociferous Codex). Some People there wanted to play high Power and suggested to join them. I told them I didn't have anything high Power casual on me, but they said their Decks could wrestle with anything cEDH, particularly as a 3 vs. 1 and that their Decks were very optimized as well. So I joined them, thinking it to be fine although a mismatched Game. I did win on Turn 2 (normal Codie Plan, Turn 2 Main Phase Ad Nauseam) and was almost shouted at for Pubstomping and bringing something mismatched. Did I do particularly wrong here/am I the Asshole for playing the Deck in this Situation?