The shackles of sexism, racism, and homophobia do not simply fall off when you accept class consciousness. These are still fights for awareness which must continue to be fought. Otherwise, we risk allowing toxic mentalities into our midst, which will only serve to alienate and expel our minority brethren.
The cages built by the state which cordon us off from one another exist in the mind, but they are very real in impact. We must fight by destroying the cages in each of our thoughts, and pass our knowledge to others so they can do the same. That is the only means to stand as one.
Let’s also not forget that there are very real shackles placed on many groups - many real cages - which we must work to destroy as well.
It’s about technological advancement and its augmentation of the human condition (think social media, phones, and the internet). There are people who resist these changes, often mislabelled as ‘luddites’ (the Luddites of the 19th century specifically opposed automation for its threat to jobs, but were reprehensive of all technology as a part of that).
This meme is just taking those who berate Luddites to their ultimate conclusion, which is a hive mind where all personal autonomy is lost, and it could be argued they cease to exist as a distinct individual. The flesh part of it is merely a means of making it more grotesque.