Yes. You know cool. The cool things and certainly the cool people. Who doesn't want to be cool?
I don't want to be cool. Someone who's cool is always in control. Nothing can shock, excite, touch, harm or soften such a person. They are always "chill" which fits with the "cool".
This kind of "cool" equates to someone who is desperately out of touch with their emotions. And that is not cool.