Does it frustrate you when you walk into a store or an office, and nobody bothers to at least glance at you to acknowledge that they see you?

I think it’s terribly rude. When I was in customer service, I don’t care how many people I had in line, when a new customer walked in I’d make eye contact and give them a little nod. I’d also make a point of occasionally touching base the same way with the people who were waiting in line.