When you don't have time or energy for a full throated denouncement of everything someone stands for, or ennumerating all the ways someone has violated community norms, consider: mild rebukes!
My latest approach to trolls and griefers in moderated communities is just to reply "don't be rude." Toxic overwatch teammate? Don't be rude. Asshole internet commenter? Don't be rude.
@lawremipsum my wife used to do cool / not cool with kids when teaching. Seems about there.
Hey Kansas City, be friendly!