Since tipping is not actually "politically correct," it's racist, sexist, and classist (1), it's a big lose for the advocates you blame.
It seemed they were under pressure from regulators, not social justice activates. I think this is the money quote
>Conigliaro said the guild forced the introduction of tipping by putting pressure on regulators. New York’s Taxi and Limousine Commission is weighing a proposal that would require in-app tipping, and is expected to hear reaction from riders and drivers at a public hearing on July 13.
They also introduced some sort of surcharge for teens as part of this change, so you believe thats also the fault of "social justice" too?
(1) https://www.washingtonpost.com/news/wonk/wp/2016/02/18/i-dar...
http://scholarship.sha.cornell.edu/cgi/viewcontent.cgi?artic...
http://www.washingtonexaminer.com/minimum-wage-activists-cal...