ironic

hypocrisy idiocy sarcasm truth unexpected

The opposite of what is expected to happen

Cherie: "Some people say that I'm superficial, but that's just on the surface."
Ron: "How ironic"

Peter: "If there's one thing I can't stand, it's intolerance."
Sam: "That's ironic"

Judy: "On one hand, I'm indecisive; but on the other, I'm not."
Stella: "Ironic"