Can you guess what was going on?

Once a pretty foreign girl met a Chinese guy at a party. She immediately felt like she wants to have a small talk with him. Coz he was well built and quite handsome. So she went to him and started with something in Chinese like 'Wow, your skin looks so delicate and smooth.' Suddenly all of the eyes focused on her, that guy she was talking with, his face went pale, even couldn't move but stared at her hopelessly. Completely had no idea what she was talking about. Can you guess what was going on?