But the flyers consisted solely of the messages "It's OK to be white" and "Islam is right about women." (I confirmed this with a spokesman for WCSU.) Such messages are of course fully protected by the First Amendment.

It's not clear whether the "Islam is right about women" message is meant (or will likely be understood) literally, as support for certain kinds of discrimination against women; facetiously, as a dig against Islam; or as a means of pointing out a perceived inconsistency among some people who both condemn sexism and supposed "Islamophobia." But any of those messages is constitutionally protected.

The university spokesman also mentioned to me that an "alt-right flag" (seemingly the so-called Kekistan flag) was "posted on a classroom building window along with some of the flyers."

(This was not mentioned in the Hartford Courant story.) Offensive flags, of course, are constitutionally protected just as are offensive words. Indeed, the very first case in which the Supreme Court struck down government action on freedom of expression grounds, Stromberg v. California (1931), involved a flag (there, a Communist flag).

I should note that, if the school has content-neutral rules forbidding posting any material in classroom building windows, leaving flyers on university property, or posting them in places other than designated bulletin boards, those neutral rules could be enforced in this situation, if they are evenhandedly enforced against others who violate the rules, regardless of viewpoint.

But I very much doubt that violating any such rules normally leads to expulsion, criminal prosecution, or even police investigation. And it seems quite clear from the University's statement that the objection isn't to littering or posting that violates such rules, but precisely to the message that the material expresses.

UPDATE: From commenter ReaderY: