[adaml_623]

Cool isn't really well defined but then again neither is passion.

But if you look at the definitions:

http://www.thefreedictionary.com/cool

http://www.thefreedictionary.com/passion

And lay those definitions side by side then I can easily agree that, yes, 'anything that betrays real passion is by definition uncool'.

[schwabacher]

I think the meaning of cool in this context would be closest to definition 6a from that link:

6. Slang a. Excellent; first-rate: has a cool sports car; had a cool time at the party.