Honestly, I think it is still fungible.

If I came into your store with a face mask and the bank across the street is raising its alarm and I pull out some cash to buy a bunch of stuff from a duffel bag, you might wonder if you want that cash, but really, how much are you thinking: hmm, that $100 bill is really worth $10 because of its history.

Now let's say I come in normal clothes, a week after a robbery, and my money looks new, but nothing else is fishy... Do you reject the money? You'd probably only do that if you strongly suspected me... And even then, do you have prejudice against the money or against me?

So now bitcoin. Here's the deal. I create a bitcoin address, you send bitcoin, how often am I going to look at its history to see if it was from a coin join or on some blacklist?

Exchanges do it for sure, but if some people look at it and treat it differently to others, then why would we only look at one type of buyer (exchange/institutions) and base our definition based on their behaviour vs on the money itself?