Coffee, how safe is it in Vietnam?

I only buy Trung Nguyen at Co-Op Mart, so I think I'm OK. Very seldom drink large quantities outside of my home.

Fake coffee, is nothing sacred here?

As far as I know, many expats love to buy coffee at Phuc Long coffee because it's strong & pure (they told me so). You can either drink there or buy coffee home to make it. They have many flavors and tea, too.
There's a small coffee shop (mostly pick & go) at 63 Mạc Thi Buoi, D.1 or one in Crescent mall, D.7

Wow! Is this true? I would like a local to confirm this as it's so scary to know that I inhale my coffee. I love it so much but I have to rethink this. At 12k a pop it's cheap but I wouldn't buy another one if this is what it's come down to. I see so many locals sitting and drinking this day and night. It makes me wonder if maybe their just ignorant or oblivious.