I hesitate to respond, but I'll try. Whether you accept it or not is up to you:
The racism in TUC was never meant to be about African Americans, or African British, or whatever(calling an Englishman an African American because he's black is the height of racism, by the way). It was meant to be a callback to the rampant racism the West expressed toward the Soviet people. Journalists who weren't careful to guard their "Commie Pinko" hate jargon in their writings and TV reportings were often fired, even if their bosses felt the same way, because of the dispassion that journalism was supposed to express, a dispassion that is sorely missing anymore.
With Soviet leaders like Stalin being responsible for more deaths of his own citizens than the Nazis' attempted extermination of European Jews, it wasn't difficult to imagine them being monsters that dragged their knuckles, ate raw meat, and didn't pull their pants down to go to the bathroom. That we in the West were aghast at supposed behaviors that secretly we knew were the worst we could see ourselves doing seemed to be beside the point.
For the record, many of the scripted lines that expressed the worst sentiments of racism among the Starfleet crew were carried over from rants and diatribes in op-ed columns in the US, directed at Soviet citizens that were, one way or another, brought to the public's attention. I personally remember similar harangues directed at Soviet athletes during the 1968, 1972 and 1976 Olympics by Pro-West commentators, on the street, and even on TV.
What makes it bad is that so much of it is so close as to be indistinguishable from the racism against people of color that has been such a dismal part of life in the US all along. Every line that the cast refused to say was either dropped or rewritten to get the point across that we may be racist and not realize it until we're confronted with it in ourselves, while at the same time making it plain that we can rise above what we were, and become better for it. Which is exactly the lesson Star Trek has been trying to get across on the subject from the beginning.
Oh and Kirk's homing beacon? All it was was a piece of fabric soaked in Viridium, that any Starfleet vessel could scan for and detect over I don't know how many light years. It wasn't supposed to send out a signal, just be something the Enterprise knew to look for. Which is actually eminently sensible.