Petty as in 'small and does not really matter' or petty as in 'vindictive'. All administrations do many small things that may not ultimately have much impact, but often those may be for benign reasons. Understanding the reasoning behind the decisions would help in determining what kind of 'petty' this is.

Absolutely vindictive. He goes out of his way to cite "DEI" in his comments.

Both.

It's so utterly juvenile and unprofessional. The kind of thing a petulant twelve year-old does for attention.