I do care what people think of me, as I believe it provides a reflection of who I am. I do make a distinction as to who says it though. Are they a lowly drinking buddy or senior work colleague whom I admire and respect? If they are a person I admire and respect and their opinion is significantly different from the person I want to be, then it can be an indication that more works needs to be done. If they are my old drinking buddy, then they are probably just reacting to hearing it many times before. However, it is ultimately up to me to define who I want to be and take the actions to get there, regardless of what people think.