the ongoing English usage

[Mike]

> Catlady: 
> > "I could care less." That phrase still irritates me, 
> 
> Carol responds:
> 
> Yes! That's the very one. If you could care less, then what are you
> complaining about? 

Mike adds:
I used to respond to someone using that phrase: "Really? How much 
less?" Of course, they'd look at me dumbfoundedly, as they didn't 
understand the faux pas, so they didn't understand the inquiry.

Nowadays, I let it grate on me silently, just as I don't respond 
to "irregardless" anymore. Gawd, that one still bothers me.