Let me try. For 20 years I was trying to find some merit to their behavior. So here goes. While YOU know your outline & shape, it’s quite possible these women & girls did not notice, they were intently concentrating of the reading. It happens. Sometimes things are more obvious to you than to others. Please be mochel on the twenty first Yom Kippur following this incident.
Yay, I did my first Limud Zchus mitzvah for today!
btw I find myself too in such situation (not exactly the same), if the need truly arises, I would somehow muster enough courage to request courtesy.