Sometimes I'll swing by Starbucks before my hour long commute to work I feel guilty each time because all but one coffee shop in town closed down but we have like 7 Starbucks now, one literally across the street from the other
Socially unacceptable? Every person I've ever worked with does this or has done this regularly at some point in their lives. There's a reason Starbucks is everywhere. No offense, but I wish this triggered more shame in people. Instead, it's normal behavior.
Some Starbucks locations operate at a loss to saturate a market and ensure no competitors can move in. Hence why you sometimes end up with them so close together.
At peak a city of about 40,000 people that I lived in had 11 Starbucks within 3 miles, it was insane.