Bitcoin is perfectly fungible. Anyone who claims otherwise is confusing economic concepts.
we already had this discussion.
maybe bitcoin is technically fungible (because any coin can always be send an mixed) but practically you have problems when using coins which where stolen (eg bitstamp hack) or why do you think new minted coins are sold with a premium?
Indeed, and as you explain we have established that Bitcoin is "technically fungible" which is really all that matters. Fungibility is a property inherent to a system. It is not dependent on human preferences.