Restroom Talk Part 2

Last week I was washing my hands in the restroom at the same time as another person I have never met. Said co-worker finished first and dried his hands and then before he left cranked out a paper towel for me to dry my hands. No words were spoken. Then later the day, same scenario, different person, same gesture of goodwill. Is this standard procedure or do I work work with overly courteous people?