That said, truly not caring what strangers at a coffee shop think about you is probably a great step toward a great life.
If you want to do it in a Panera or SBux go ahead but not in a local shop. Being conscientious is actually a good thing, believe it or not.
I saw a guy with a Commodore PET at a coffee shop in Toronto once.
And more than once, I've been that guy with a TRS-80 at a Coffee Bean and Tea Leaf shop in Las Vegas.
A TV reporter who stopped in for coffee seemed interested in what I was doing, until he saw that I was just playing Monopoly.
Nobody's going to want to talk to you if you show up with a full iMac setup.