If your cartoon series accurately represents life at Evergreen College, one can scarcely find anything contradictory in the generic presentation of all character types whatever their ethnic origin. The school itself seems to be a charicature of social misfits who, as you imply, are still entitled to a college education and the right to speak out and be heard.
Memoirs are hardly accurate that fail to depict the nature of things as they were, or are. The inability to laugh at ourselves is a contemporary failing that sets people at odds with each other who ought to be acceptably amused at their own foibles, whether individually or grouped.
Most of us carry the burden of shortcomings, character twists, physical oddities, or ethnic strangeness that move others, who belittle, applaud, misunderstand, or ignorantly perloin our uniqueness, to defame with humor. In times past, as I remember them, we used to laugh at ourselves and others. Now, the personally offensive has destroyed our sense of such self-deprecation (a form of humility) by arousing ire instead of laughter. We are a poorer society because of it.
In short, I see nothing wrong with your cartoon, if for no other reason than it shows everyone in the same light. Whether the nature of what you depict is either good or bad is irrelevent in this case. But neither can I pick out any single instance where you have maligned or charicatured one person or type over others. Even the last panel, which is the only one that isolates a character type, is consistent with the preceding panels, so can hardly be said to have implied an abuse of ethnicity, since all your characters express a similar level of intellectual or social crudeness.
I guess my question is, what's the fuss?