It's always funny to watch and unskilled pilot crash and burn. Just cause a deck puts up results don't mean it's gonna make you put up results. You gotta practice with that shit and learn it inside and out.
Half the reason I was sad Mox Opal ate it in modern for the sins of Oko/Urza was that I had played Affinity (which didn't even really use affinity cards anymore, it was mostly metalcraft stuff) and knew the deck really well. Same for Hogaak and Faithless Looting, Izzet Phoenix was legit a fun deck to play and to play against if you know how to handle the fight.
If you were using some stuff like Demonic Tutor, Tolarian Academy, Sol Ring or any of the other older busted stuff I could kinda understand his complaints, but it sounds like he just sucks at the game.
The formats most people play are: Commander, Draft, Cube Draft, Standard, Pioneer, Modern, Legacy, Vintage. (Good luck on finding anybody to play the last two with IRL $$$)
Card prices are tanking too right now, wouldn't be a bad time to grab stuff you've wanted if you got the spare cash.