Go Karen!
Your life will improve exponentially when you decide to stop giving a fuck what people say or think. If you need to call the manager, do it. Feeling threatened and need to call the police? Do it. You're a taxpayer and a citizen. Don't be intimidated by the petty sanctimonious crybabies on the far left or the inbred knuckle draggers on the far right. Most of us are just people - good people. When we eliminate 10% of people from the left and right extremes, we have a sane, kind and considerate society that doesn't need to attack anyone for their beliefs or skin color or financial status.
Karen, you may actually be an unpleasant pushy and unlikeable person, but you do have a right to ask for the manager, even if you're not someone I would choose as a friend.
Go Karen!