Having your dojo located next to a Starbucks might make you look a little more legit, but practicing outside while Starbuck customers are trying to enjoy a cup of coffee and relax is embarrassing.
C'mon guys, no one is going to think you are cool for practicing outside. All they are going to do is shake their heads and roll their eyes.
You have a dojo for a reason, go inside and get practicing.
Leave the old-timers in peace and let them drink their coffee.