It's not a gun, it's a space typhoon.

I was playing a game against some noob with a terrible deck (unfortunately I am unable to access his decklist), but trust me, it was bad.
By the second turn, he argued profusely about the rulings on MST.
I went first, setting my MST and setting Sangan down in defense position, an appropriate first move (especially considering how I had no traps in my hand).
He went second, firstly setting a monster in face down defense position (fair enough) then setting a trap, followed by activating MST on my MST... I of course chained my own MST to destroy his other set trap, to which he said "YOU CAN'T DO THAT!". I then tried to explain the mechanics of a chain link, but he simply would not listen... he tried to tell me that, because his MST destroyed my MST, I am unable to activate it. He said - "The gun has been taken out of your hand, you can't use it anymore", to which I replied "What gun? It's a space typhoon.". - he then proceeded to tell me that he owned a card shop and ran tournaments all the time (musn't be very good tournaments, eh), even though I doubt he owned a card shop.
Has anybody had any bad duel experiences?
Comment and let me know!