What is it with men not having good customer service skills?

I am a server at a restaurant. I am a women. I smile and talk to people in a friendly voice. I have noticed that men don’t seem to do this. They do the bare minimum. Speak in monotone, don’t smile, etc. There are a few exceptions – for example men that work in big chain restaurants have better customer service skills ( Humorous Example ) – I would assume that these big chains have more extensive training and higher expectations than smaller, less established businesses.

Does anybody else notice this? Is it just me, or do men not have good customer service skills, in general? Why is that?