what accumulates

[unpakwon]

Would you please explain the following in red more easily?

Jobs got an audience with the Atari's president. But Jobs' youth and inexperience was showing. While trying to charm the executive and win his support, Jobs propped his bare feet up on the man's desk. The man got a front-row view of what accumulates when you don't wear shoes. It was a deal-killer.

Thank you.

[BobK]

I imagine he'd been walking on carpets. What accumulates in such cases is fluff nestling between the toes.

b

[5jj]

The man got the closest possible view of the filth that can gather on the soles of your feet if you do not wear shoes.

[unpakwon]

Thank you all for the help.