What they see as "SJW agenda" or "multicult" or whatever are just core tropes in it. Cyberpunk was a reaction against the escapist square-jawed-space-marines-and-spaceships-and-galactic-empires-oh-my type sci fi that the genre was largely identified with before then. It was about technology on and under the skin, how that molds society and people, the logical outcomes of runaway capitalism, consumerism, and ecological destruction, mass migration, displacement, anomie. I was in early teens Neuromancer was published. I was already a giant sci-fi nerd, knew my Asimovs and Heinleins and Clarkes and Lems and Zeleznys, and man was it a revelation, the whole genre blown up and put together in a new and radical configuration. You had to be there, man.