I had an unfortunate habit of telling people about their area of interest or expertise, things I felt they didn’t know. This was just to show the person I was interested and wanted to impress, rather than wanting to show anyone up, or engage in one-upmanship.
Finally I realised this can be really annoying and I have completely stopped and am a bit embarrassed I ever did it.
What are yours? Maybe we can help each other see blind spots.