"No…I don’t like disparaging people to their employers............."

Lena,
That's the problem with being a nice upstanding citizen.
I've been in retail for 25 years and I can tell you for certain that a good employee would never take it personally and a smart business owner will greatly appreciate your candor.
I've lost customers because they didn't want to offend anybody. They just took there business elsewhere while I was stuck with an employee who was driving yet more people away.
I don't mean to sound preachy but I thought you'd like to see the view from the other side.
Trace