Some great points up thread.
I do think as a society that everyone is tired and burnt out and it shows (both customers and service providers)
I also think technology plays a large part. As a society , all of our communication has suffered. People are just glued to phones or tablets. People don't look up at people and make eye contact or engage in chit chat. Half the time the people serving and the customer and texting or looking at their phones.
On the technology note, sales people know half of us are going to just browse the tech in Currys and then Google it on 'AO' and ultimately buy it off there. So 'what is the point '.
Also, people are savvier and wiser (thanks to technology) and don't readily buy into the sales pitter patter and know our rights. So once again what's the point of all the smooth talk ?
Parenting : I was bought up very strictly with good manners and social etiquette and how to do good 'customer service' . My mum was very strict about what you wear for an interview, how you talk to people etc etc. whereas now, I'm not sure those things are impressed upon young people anymore. You hear waiting staff in restaurants reeling out the generic "how is your meal ? Is everything ok?" Said in a monotone robotic cliche that's straight from the manual. There's no 'personality' in there. It's all a bit soulless. I think these 'skills' just don't matter to people anymore.
With everyone encouraging their kids into white collar uni jobs, nobody values the importance of basic good customer service skills and taking pride in your job, even if it's not a "high up" one.