Gay marriage succeeded as a movement long before the issue of wokeness came to the fore (with the BLM movement). If you actually read the positions of the thought leaders of the latter movement (people like Ta-Nehisi Coates) the argument is exactly what liberal, white, and right-wing people are afraid of:

The Case for Reparations [1]

People are right to react with vigour to these sorts of large-scale redistribution plans. This is a design of the far-left in academia that has its roots in the communist movements of the early 20th century in Europe and Russia, whose worst excesses led to the deportation and execution of millions of Kulaks in the Soviet Union [2].

You might call this a slippery slope argument but the historical precedent was exactly that: a slippery slope where society slid all the way to the bottom. Once enough people have convinced themselves that it is good and right to use the political process to take property away from a group they consider to be their enemies, there is no limit to the amount of destruction they can achieve.

[1] https://en.wikipedia.org/wiki/The_Case_for_Reparations

[2] https://en.wikipedia.org/wiki/Dekulakization