A couple of weeks ago, I joined a newly formed mid-week Bible study group. I had visited the home of the leaders many times. They don't have a shoes-off rule, but most people visiting them tend to take their shoes off.
The first week we met as a group, everybody took their shoes off except one lady who kept her boots on. The next week everybody removed their shoes except her. However, half-way through the meeting she decided to take her shoes off and put them by the door. Although the hosts said it was unnecessary, she must have felt an overwhelming psychological pressure to conform to what everybody else was doing.