The simple reply is that it's the supreme law of the land in which this country is based upon period. If it's outdated, or those who claim as such they need to shut their mouths and get off their lazy asses and move congress to repeal it's articles or amendments by 2/3 rds of each house and then ratified by 3/4ths of the states. Furthermore, if they are referring to the second amendment remind them that it was recently addressed in the Heller decision by the Supreme Court a year or two ago. Tell them they need get into school and call them traitors as well. It's not so much that it's outdated, they just don't like it nor respect it.