There are words and phrases in English that get used sarcastically so often they lose their original meaning. There is a word for this and I swear I've seen a whole list somewhere but my google fu is weak today.

There's a fat chance you're gonna be eating those words.

Now, I expect to be down voted.

I don't care, but I'm going to piss a lot of people off.

I say "I could care less".

That's sarcasm. It's what my nineties, heroin chic, grunge music adolescence gave me.

I could care less. It would just require that I make an effort. That's not caring less. That's caring about something.

It's like how the biggest homophobes always seem to be closeted. They care too much.