RUDE STAFF AT PLZ BOARDING GATE, WOMAN NEEDS A REALITY CHECK

****** white lady at the PE boarding gate decided to give a hard time about my hand luggage which i have carried multiple times on flights , the bag is in spec and under 6kgs but i was embarrassed and shouted at, like I'm inferior she yelled "did u check it in" "'i will check the footage if you are lying yo me" "if you are lying i will find out "people around even looked at me if im doing something *******. i told her i carried this bag multiple times she then said the people that allowed it should be fired. I've never had an issue with the staff and a lot of my friends who i have done flight training with are now first officers and captains so i actually look forward to running into them onboard or hearing them on the intercom . i had to rush back to the gate to pay for the bag to be checked in, with less than a 5 min window i had to run around the airport . only to find that people had carried much larger bags onboard to stow in over head bins. my question is, why were they allowed and not me ?? why did she not measure and weigh my bag ?? why was she making a scene ?? why was she rude ?? there was only one thing i found in common as to why she would have made m send me bag to check in. i have no issues following rules, however the people enforcing need to comprehend the rules and enforce it onto everyone . the only reason i kept my composure is im a frequent flyer and im always at the airport and i do not want to be known as that pilot who had an issue with ground staff .