Thanks all.
The goal is really “don’t feed the troll” as the individual in question loves to take the counterpoint in discussions, be contentious, and in general hasn’t found an internet hill they are unwilling to die on.
The tough part is generally speaking they contribute positively when they initiate a topic or post. The challenge is how they choose to respond to others.
My rationale is if I can deny the dopamine of likes/reactions maybe the behaviour changes.