Attitude towards juniors

I was very hurt with the way Dipuo treated her ***orker in front of customers, she was very rude for nothing because she wanted clarity but hell no it was like she didn't know her work. It was like a personal vendetta. Fortunately the cashier just kept quiet and carried on with her c****s. But it is wrong dispite being a senior one has to respect your junior in front of clients. Dipuo your attitude sucks.....