There are two types of people in this world: People who use “ironic” incorrectly, and people who insist on correcting the other people.
I really hate that I just used that two-types-of-people trope, bit in this case I think it’s pretty true. I have not way to prove this, but I feel pretty confident that every English speaker has used “ironic” incorrectly at least once in their life, and there’s a good chance that someone made you feel pretty darn foolish for that mistake.
I used to be the person who made you feel foolish. Every time I heard “ironic” when I was expected to hear “coincidental” or “serendipitous” or “seriously” instead, I would cringe and feel compelled to say something. And even though I tried to remain polite about it, teenage awkwardness and my generally horrible use of speech made a simple correction always came out as a really judgmental insult. I really wish someone told me how much of a jerk I could be (or that I listened when someone already did).