Forum:Magic Cylinder vs Ancient Gear Golem and similar monsters

Me and some d00d were arguing about who would win Underground Arachne(OCG) or Magic Cylinder... So what he said was that Arachne's effect wouldnt apply since there will be no damage step cuz arachne's effect lasts until the end of the damage step. Meanwhile I was on Arachne's side where it clearly says that when he attacks my opponent cannot activate spells or traps, out of this i made a conclusion that magic cylinder wasnt supposed to be activated in first place... So, that guy kept calling me a noob, retard etc.

Please help guys...I just wanna prove him wrong...he insulted me...bastard

Btw, it would be dumb to say his name *coughNonpareilcough* cuz hes a twat.

Btw the game we played was DMU (BYOND).