Just to be sure we (I, anyway) know what is annoying me. It is
not the red dotted underlining.
What IS annoying:
#1: The "automatic" correction does not work as it does in iOS. In that system, the machine offers a correction and actually inserts it into the text unless one specifically disapproves it.
In Mac OS, all I see is the red dotted underline. If the misspelled word is already in the list of Replacements, the OS will insert it, whether I want it to or not. I was frustrated yesterday when trying to type a date: 3/3/4. Each time I typed the "¾" part, it replaced it with the fraction (just as it did now). I finally managed to force the OS to leave things alone by typing "3 / 4" (I added a 'space' on either side of the "/").
#2::
When I select a word that I either know (or think) is incorrectly spelled and control-click (right-click) it, the correct spelling may or may not replace the selection. Sometimes it does. Great!! But quite often, it simply sticks the correction at either end of the selection or even exactly under the location of the cursor thereby splitting the original word into two parts. DUH!!
What is the point of
that?!