Not a fan of KO yb any stretch, but that reads like a chickenshot email. Seems from reading between the lines that many people hated working with him and wanted him fired, so they documented every possible thing he did that was offensive. But bitching about throwing a glass and “creating a potential slip and fall hazard” is laughably lame.
I don’t think there is a major US corporation where shattering a glass in anger in an accessible area would not get a guy fired. Try it at your job and see how it works for you if you think it is such a “lame ass” complaint.