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
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No there friendly rivals.
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NO becuse they love each other and did not cheat on there girlfriends
Sega doesn't hate Nintendo, but, in the 80s-90s, they did have a little rivalry, and people have to choose between which console to buy, Nintendo's console, or Sega's console. Now, Nintendo has let Sega use Mario and many other Mario characters in a few different Mario and Sonic Olympic crossovers.
Wario hates Mario because when they were kids Mario use to bully Wario while playing games with each other, but now their relationship has gotten better.