Seems like an unnecessarily snotty response - but of course he's within his rights to prefer not to allow viewing. And roadies spend long hours perfecting that air of condescension - it's as much part of the culture as leg-shaving.
In his favour, he's got 100% feedback on over 500 transactions, and despite the all-caps auction description, he spells (and uses) "commensurate" correctly. The feedback he's left is polite and literate, and all the frames he's sold are of about the same size, suggesting they're his personal bikes rather than some stolen hoard.
My advice: take a deep breath, smile, and spend your money elsewhere.