Everyone knows that putting a Led Zeppelin or Ramones t-shirt on your toddler is obnoxious; we get it, you're still cool even though you have a child.
Conversely, helping your little one create the perfect Johnny Cash Halloween costume is just good parenting. The sooner they know and appreciate the man in black, the more likely they are to make good musical choices for the rest of their lives.
If this kid comes to your front door, just give him all the candy and turn your front porch light off. Halloween is DONE.