Yes, everyone has mayonnaise. No matter how you feel about mayo, there’s no chance that you’re as passionate about it as the Japanese. Japanese mayonnaise isn’t the weird part of this, it’s the fact that they manage to put the stuff on just about everything.
Some people even put mayonnaise on stuff that mayonnaise should never touch. That being said, Japanese mayo is different from the stuff we’re used to calling mayo.
It’s thinner, uses different vinegars, and uses different parts of the egg than regular mayonnaise does.
It also has MSG in it, because people in Japan aren’t averse to the ingredient. That means that it has that umami taste that MSG provides. Needless to say, people really like mayo in Asia.