This is not a joke thread, I'm serious about this

I want to know the science behind this

How come everybody likes the smell of their own poop and farts, but hates the smell of everyone else's?

It's something that has boggled the minds of men for a long time now LOL

I'm being serious too, I want to know why

I don't enjoy those smells even when they come from me :|BladeOfHeaven

really? LOL seems like everyone always likes their own