Why is it any skin off your neck that Benny is thanking someone, like that's a bad thing? I was brought up not to expect any thanks or extra reward for what I was SUPPOSED to do, but then, these people could choose to be in any profession they wanted, but chose to work in public service. A few nice words go a long way. I fail to see how anyone would/could have a problem with that.
Most people do not listen with the intent to understand. They listen with the intent to reply.