Your view is overly simplistic. Specifically, you are conflating structure with purpose, strategy, and operational tactics.
Of course, self-segregating groups always existed as structural entities. However, in my experience back in the 80s, the groups’ purpose was exposure of that group’s culture on campus. And the strategy used were often “celebrations” where they had events where all students of all cultures and races could attend and have fun and learn something in the process. Any activism was wider in scope and reach. For example, Divest from South Africa and support for the Eastern Block trying to free itself from the then Soviet Union. The operational tactics were pretty standard with teach-ins and speakers to campus and a few peaceful demonstrations, such as walking through the dining hall with signs etc.
Now, fast forward to today. The self-segregating groups are not about celebrating their culture in as much as they are about denigrating any other culture they deem offensive - that is a totally different purpose than in the 80s. Today, one cannot even do stuff from their culture because that is appropriating according these new activist. In contrast, in the 80s, affinity group students were just fine, often proud too, when they saw someone else doing something from “their culture.” Not today. And the current strategy is to make other non-affinity students feel uncomfortable and the chosen tactic is to directly attack students who are different and who practice a culture that they view as one with privilege. And privilege means whatever the affinity groups say it means. Therefore, nothing is off limits as to being offensive and to complain about. And the larger causes I recall in the 80s are replaced by comparatively smaller, self-centered goals. Such as activists at Oberlin wanting more money for affinity groups, more self-segregating professors, and demanding Oberlin to bring in felons as students - note this is all about “me” and my culture - a much more limited scope.
In the simplest terms, in the 80s, even when I disagreed with affinity groups goals, I understood what they were doing and could see the larger picture of what they were trying to better. Today, what I see is activists dumbing down the system and requesting that the short-comings they think they faced be imported into the college environment. And to them the only way to take away privilege, as they see it, is to lower the bar, lifestyle, goals and the like of colleges today - in short, it is about taking something away from the supposed “privileged” students. It really comes off as misery like company and forcing misery on other students - a rather low-life approach.
In contrast, I had no indication or thought that the affinity groups in the 80s were trying to dumb down the environment or to take things away from other students. Much less I do not recall the affinity groups trying to make other students feel bad about just being who they are, which may be simply a smart kid from Omaha.
Therefore, it is not the maintaining of the affinity groups that is the problem; it is the affinity groups’ goals and objectives are totally different, and not in a good way.