Do you let your LO go around the house barefoot most of the time?

DH grew up in a house with all marble and ceramic tiled floors. His nephews are there all the time too and barefoot. Everyone in his family is so much "tougher" against the cold than I am (and everyone else who comes to their house for that matter! lol!) I'm always FREEZING at their house! Even in our house now with all the hardwood, my feet get really cold unless I have the heater or slippers on. #imawuss

DH said going barefoot on tile makes you stronger/tougher against the cold. I'm thinking there is some truth in this? What do you think & do?