Bitcoin is perfectly fungible. Anyone who claims otherwise is confusing economic concepts.
wow really? lol
here is the definition of the economic concept of FUNGIBILITY:
definition: Fungibility is the property of a good or a commodity whose individual units are capable of mutual substitution. That is, it is the property of essences or goods which are "capable of being substituted in place of one another."
You sure you want to claim that it is "perfectly fungible"?
If someone decides not to accept some bitcoins vs other bitcoins ....then it is no longer "perfectly fungible".