[ Etiquette ] Open Question : Why do people think I ignore them on purpose at work?

I work at McDonald’s. On multiple occasions, an hourly manager at work called my name multiple times and I never answered. Why? Because I didn’t hear her. She never believed me when I said I didn’t hear her. Well, I was doing something else. She called for me 5 times? ok well I didn’t hear her any of those times. She’s not the only one. The GM sometimes tell me to do something 3 or 4 times b4 I hear him. He doesn’t accuse me of ignoring him. Yet, she says I never listen and ignore the hell out of her. If I’m getting something done, I’m focusing on it. How can anyone expect me to hear anything more than few feet away? Outside work: I could be getting out of a friend’s car when they drop me off somewhere (like work) and as I get out, she be yelling my name but I wouldn’t hear a thing. Then she be so damn offended. Well I was already several feet away