It depends on the idea of "normal". I've owned 5 M cars, including an F10 M5, and that car was the only one to have brake squeal. It was awful but I had dark tinted windows so i could hide.
It's not normal. More like "typical for M5s" than other cars, perhaps. But still unacceptably not normal, and BMW should do something about it.
And personally, I wouldn't accept any discussion along the lines of "it's your fault" or that you're driving the car wrong.
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