Right... Except that you have no way to actually tell which is which, and that's a problem. It's very easy to fall into the trap of using "dog whistles" to confirm a preconceived notion that somebody is a racist, thus setting up a circular argument. Doubly problematic when people are out there using it as justification for their own excesses.
For example, the whole "punch a Nazi" thing. Lefty extremists feel justified in assaulting people on the grounds that they are 'fighting fascism'. But they are the sole arbiters of who is or is not 'fascist'. It quickly devolves from *actual* fascists, to simply anybody who opposes them, and then simply anyone they don't like.
If you look hard enough and sufficiently broaden your idea of what constitutes 'evidence', you can
always convince yourself that somebody is racist.
I can absolutely assure you that
nobody is planning or obsessing over all the nutty stuff Trump says or tweets.
I can also assure you that there is no "racist whisperer" code book out there, and no klan meetings where they all get together and decide on which words and phrases count as "dog whistles".
Personally, I've seen the left misidentify so many people on the right as "racists" over the last few years that I'm over it. The problem is, now they're using it as justification for shutting down speaking engagements and smashing people in the face with bike locks.
Best,
-Slashy