Why do some older people think they can say whatever they want to younger people at work and get away with it?

To give you guys and ladies some insight, I work in a supermarket and there is a mixture of baby boomers and millennials and 18-year-old's. I am a guy and I am a millennial and I have this lady who is a boomer and she constantly pushes the boundary limit with me. For example, usually I am by myself helping the customers, and she gets mad whenever she has to help the customers and the latest incident is that I was helping a long line of 20 or more customers and she was told to stop her job of organizing some stuff and help me. Now she is on the same level as me, she is not a boss. She is not even a lead and she has the audacity to tell me to stop talking to the customers and tell me to move by the balls and move faster. Now, I didn't even say anything rude to her because if I did say anything back she would find it offensive and I would be in even bigger trouble for being guy and she an older woman. So I told my supervisor what happened and he talked to her but she got so mad that she refused to speak to me and did even more offensive things to me. After that I went to Human Resources because every manager has tried to deal with her and its not just with me she does this too, she does this with other people but the reason she is not mean or offensive to anyone else is because everyone else puts up with her being bossy and I and another coworker does not. Sorry, but I don't care how old she is; just because she is older does not give her the right to speak to me as if I was one of her kids. I don't care if she finds it demeaning to be equal to a 20 year old and before some of you tell me, "oh maybe she is trying to help you and guide you", For one I don't need guidance because I have been at the company for 3 years now and my supervisors don't have a problem with my work because I get top reviews from all of them and they trust me to help train new people when they hire new people.

Why do some older people think they can say whatever they want to younger people at work and get away with it?
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