In my headcannon, they react this way to her heroism in the Time War and other universes. And get upset with Twylight and co for their betrayals includign MArer Do Well, the Walking Dead, Twylight’s pupeteering the divioson with Rarity and the cheerleaders, and Rarity’s wing stunt….. the turht reveal by Ice Warriors checking to see who seeks to slay Rainbow. Hmmmmm.
And they also react this way when Jane rewards Rainbow the WIld HEart, a medal for virtue, for helping to save the wild from poachers. And to adopting Scoodaloo.
And also to Daring Do who be WIndy’s sister.
And also to Rianbow marrying Soarin, and getting grandchildren.

It be sweet if we see more of them.