Most of the angels have been rather indifferent (minus the seemingly "evil" reactions of some). Even Vados' attitude towards Champa is rather indifferent, she even pretended to cry if he was to get erased. The only character that Vados "respects" is Goku.
Out of all the characters, the angels certainly reflect the attitude of their "godly" positions most of all. They're "above" the pesky antics of the mortal world, and their indifference clearly reflects this. While the Kais obviously have their own emotions (likely because they're beings of creation and "tied" to the mortal world more closely than the other deities) and the Gods of Destruction are former mortals (once again - emotions), the angels are truly the most neutral "godly" beings of the series so far. If the Grand Priest is TRULY looking to usurp Zen-Oh (is this an allegory of Lucifer/Satan going against God? Because this would very much be like the Biblical "Fall of Lucifer" when he turned against God with his rebel angels), he's possibly looking to eliminate ALL his potential challengers (The Universes' most powerful beings aka God of Destruction candidates) before doing so.