FWIW, here's how I use the terms.

The definition I use for irony is "mocked by fate". Someone may well say something ironic, but never intentionally so. "Nice driving" would only be ironic if, in the process of shouting it and waving one's clenched fist, one crashed. I accept that many people use the -"Nice weather we're having" when it's raining- definition of irony but that is, to me, simply sarcasm with no intent to harm, if not merely a conversation-starter. I use sarcasm as "a form of expression in which an intended meaning is the opposite of the literal meaning of the words used". My usual intent is humour, not harm.

The incorrect use of the terms irony, ironic, and ironical (yes, I've heard it many times) is one of my pet hates.