Agreed.
At 18, I was literally a demon and when I remember it today, I wonder what demons had possessed me.
I used to swear at my mom (though, not right in front of her), and we were constantly at loggerheads. The more she tried to put me under her various atrocious rules to suppress my outburst, the more I fought her off. My anger would just double up instead of dwindling in fear. Nevertheless, I still knew she loved me. I think it just happened that she didn’t know how to handle a teenager correctly. There’s no one correct method though. It all depends on various circumstances.
Despite that, when I was sick, she forgot all our ups and downs, and gave me the utmost care and attention, as if nothing had ever happened. She (and dad) gave me all, and I wasn’t too stupid to not “see” that.
Besides, it was from my mom that I learned to believe in God (before turning into an atheist many years later, that’s another story).
Today, I share my faith with her. She is my best friend that I failed to find in her during my teen years. In my humble opinion, mothers (and fathers) should be able to set an example of kindness, patience and forbearance by being one themselves. Threatening will only arouse bitterness and hatred in children. They might be “disciplined” but you wouldn’t be able to discipline their heart. In there will be growing a seed of deep hatred.