Bad
divisive - Causing disagreement or hostility between people, tending to disrupt unity or harmony.
The election was fought over the deeply divisive issue of immigration, and people on either side of the issue can't see things from the other point of view.
caustic - Sarcastic or severely critical, often in a hurtful or biting manner; or able to burn or corrode organic tissue, typically referring to chemicals or substances.
The caustic chemical spilled onto the floor and quickly started to eat away at the floor surface.