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