I don't know why anyone would ever be ashamed of that. Based on my very limited understanding from reading a couple of articles in a science magazine, it would be weird if I didn't, based on geography and ancestry. If I do, though, the Neanderthal part either didn't pass on much genetically, or were pretty fine-boned. My wife has more of the sturdy skeletal traits that were said to be associated with Neanderthal physique. Our kids are one more like myself and one more like her. Genetic lottery is just weird.