Nowhere in the rules does it say that

It's a bad joke that some people say

You don't, it's just a preference some people have.

The WR does Hariet first lol

Yeah there's no difference between which one you do first, just different streamers did different ones first because of preference and it turned into a joke. (Some people also say runs that don't do XD skip will be rejected but that's just a joke too)