There is an argument that crops up from time to time when you argue on matters of social justice on the internet. No matter the subject, at one point or another someone will say that this problem has already been solved because some specific thing has happened.
We no longer need feminism because men gave women the right to have jobs or have the vote.
We no longer need civil rights because white people gave people of colour the vote, and interracial marriage is allowed. Or because slavery is over.
We no longer need to worry about disability rights because the abled have made laws about accessibility and not discriminating.