Sarcastic
'Oh great, another all-hands. My favourite.' Barbs land on people, often with a smile.
Rule out first
Group culture where sarcasm is the dialect. Genuine wit that the targets enjoy. A real frustration they can't voice another way.
What could explain it
Humour (as a mature defence): It's light, includes them as a target, and lets everyone breathe; people laugh with them.
Contempt: Eye-rolls and sneers aimed at people as well as situations; recipients feel small.
Passive aggression: The sarcasm carries a complaint they won't make directly; ask, and they deny any problem.
Envy: The barbs aim at people who are doing well, especially in their own area.
Everyday sadism: They enjoy the wince; the sarcasm escalates when it hurts.
A next move
Ask directly, in private: 'it sounded like you have a problem with this; what is it?' A clear answer means frustration; denial means passive aggression; amusement at the hurt means something colder.
If it’s you
What would I have to say plainly if I couldn't be sarcastic about it?