Many years ago, I was the global "head of support" for the main trading application at a large bank.
I sat on the trading floor (b/c most of my users were there) and one of my jobs involved training the newly hired junior traders how to use the software.
The training was usually on their first or second day on the floor. At this point in the story, they were INCREDIBLY polite to me. "Thank you so much for showing us this", "Wow! This training is so great! We really appreciate it!"
Within two or three days, they stopped saying hello or even talking to me unless they were having an issue or there was an outage.
Reading about how ranking determines social interactions in the tennis world resonated rather strongly with me given my experiences working in technology at a bank.