I'm old enough to remember the cops from the 1960’s and 1970’s. My interactions with them were always friendly. I had no hesitation in, say, just walking up to a cop and asking for directions. That is not true today. Ask a cop anything today, and you'll likely be treated with veiled contempt.
We are now caught in a downward spiral. The cops (understandably) are harder now. And that leads to resentment among the public. And that makes the cops even more defensive. On and on it goes.
I completely disagree with your assessment. If anything, cops today bend over backwards to act “sweet” to everyone, particularly special grievance groups. Otherwise, they risk unfounded, but actionable, accusations of “discrimination” and “micro-aggression.” Cops were much more staid and bluntly to the point decades ago - if their brusqueness seemed impolite, that was just part of their understandable demeanor because their core function was dealing with the absolute worst in society who followed NO rules and couldn’t care less how “nice” you were to them. In fact, the hesitance to enforce the law implied in “niceness” was an invitation to capitalize on it.
Muscle bound cops with shaved heads means one thing to me: Steroids. If you have ever seen roid rage you know what I am talking about.
My memory is as a youth getting caught drunk driving by a highway patrolman who was an acquaintance of my family. He gave me a polite but firm admonishment and then told me to get my butt home. He followed me home to make sure I got there safely.
If I had a wreck after he caught me it would have been my fault. Today it be his fault for not arresting me. And I did learn the lesson.
Todays police just can’t make allowances for each situation.