[@Akayaofthemoon] That's about what I got out of it too, Yellow Diamond likely has a lot of baggage attached to the earth because of her hurt pride.  It makes me think, maybe the rebellion on earth was the first time homeworld ever lost a conflict?  It would sort of make sense if even Yellow Diamond is this hung up about it.  It also calls back to how bent out of shape Jasper got upon meeting "Rose."