I get the same thing at home. Wife was taught to fear under cooked MEAT, not just chicken, from a young age. Her and her folks refuse to change with the times. Any hint of juiciness in any meat "it's under cooked"
I take MY chicken off at 160 (dark meat 175), MY steaks at 125, MY pork at 140-145. Her stuff gets left on the grill while mine rests. I enjoy my meal with a nice Bourbon. Shes chews hers and washes it down with a gallon of water. She says she likes it. Wont even try it cooked perfectly!