Get Precheck or global entry. I only do a scanner every 5 years or so when I get pulled at random for it. Otherwise it's metal detector only. Unless your zippers have such chunky metal that they set that off you'll be fine. My belt and watch don't.
Note: Precheck is incredibly quick and easy to get; and GE is time consuming and annoying, but has its benefits if you travel internationallly. Both give the same benefits at TSA.
Second note: let's pretend someone replied "I shouldn't have to do that just to be treated...blah blah" and that I replied, "maybe not, but a few bucks could still solve this problem, if it bothers you enough that's worth it to you."
"Just pay to not be harrassed or have your rights/dignity stepped on" a typical take to find on the orange site.
...maybe not, but a few bucks could still solve this problem
Sure, can't argue with that. But doesn't it bug you just a little that (paying a fee to avoid harassment) doesn't look all that disimilar from a protection racket? As to whether it's a few bucks or many, now you're just a mark negotiating the price.
The brownshirts will never get my money.