Straight razors have always been the weapon of choice for the bar psychos and transvestites, while they aren’t good for killing, they have always been famous for their scarring.
They are good for the transvestite because they can be used to whack the head to cause a lot of bleeding and theatrics, to violently settle disputes and release emotion and enable escapes, without killing the other guy.
Is the straight razor coming back in favor among blacks, as a carry weapon?
Not to my knowledge; while they are small/light and easy to conceal, they aren’t much good against even a good club with better range.
A pipe in the sleeve is the tool of choice in the knockout game now.