I get it now
A lot has been said about "dog whistle" politics—saying unacceptably rotten things using words or phrases which have plausible deniability all the while your target audience knows exactly what you mean.
Hence Trump's rubbish about supposed immigrant Hispanic rapists is really a callout to the gutter-dwellers who think everyone with darker skin is subhuman.
I notice that he was doing it with encoded attacks on gays, as well. I think that may be the first example of successful 'homophobic encryption'.
Fetching coat, now ... and no, making a joke doesn't make the activity itself any less nasty. Dark times.