I'm not sure I follow. You think the thousands and thousands of people at universities online sharing stories of discrimination in their day to day lives are all part of some elaborate hoax? And how would such things get corroborated and documented anyway?
The small stuff (90% of the Purdue Twitter feed you linked), while no doubt unfortunate and frustrating in the moment, don't move me. Why? Because I don't think the universities as institutions are responsible for any of that so long as university staff/student govt/Greek system/etc. aren't involved.
How documented? One guy on the Purdue Twitter feed took a picture of the offending poster, for example. Corroborated? This matters when an accusation of
institutional racism is raised. Otherwise, how do I know that an issue between Professor Smith a given student is more than a personal issue between the two?
I guess if you want corroborated, documented, established examples of racism in America and its impact on people and communities ...
No -- you (or they?) are changing the scope of what these protests are supposed to be about and what the universities as institutions can fairly be held accountable for. I'm sorry racism still exists in America -- not U of Misssouri's, Ithaca's, Purdue's fault or problem beyond the policies and actions of their staffs and official affiliates.