No there friendly rivals.
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They don't. SEGA and Nintendo used to hate each other in the 90's, but not anymore. No one said sega and nintendo both hated eachother ever. what are you talking about. And as for sonic and mario, they havent ever met unless your reffering to sonic and mario at the olymipic games, then no they don't hate eachother....... Just rivals
Sonic because he was made first and Mario is trying to copy him... Sonic > Mario, in a lot of peoples minds.
Mario
Mario came first
Cheese