I get what you're saying with the whole role model thing. However, most people know that junk food doesn't hold any or little nutritional values. If Floyd was eating bunch of pills, powder and such in front of the TV, then yes, it would be a problem.
There's nothing wrong with eating fast food, AT TIMES - just remember to have a balanced diet. I seriously don't believe that Floyd does this every week after a training session. He's a gym rat. It won't affect him.