Here's the solution:
Tyson: "Excuse me sir, are you a veteran of our nation's military?"
Old Man: "No."
Tyson: "Then quit your bitchen, pay for your shit, and get the fuck out of this line. You don't have the right to whine about your life to the point where it fucks up the day for the rest of us."
If he says "yes", then thank him for his service and let him bitch all he wants, he earned the right.
