Not because I am reluctant to spank a teenager, but because they have learned the lessons of their childhood well.
I'm left to wonder, trivial to whom? If he would like to talk things over with me, I would be happy to address his concerns.
Then when you misbehave in church, the congregation will ask you to leave instead of your dad tanning your rear end.
However, let us just suppose that your dad has gone beyond the beyond the bounds of reasonableness; what can you do about the problem at nineteen? It will be rough because living always ends up costing you far more than you would expect, but then you would be truly independent.