Color me confused.
No one here has said that the Professor should not be allowed to speak her mind in the public sphere. There is no organized movement to have her fired. There is no movement to have her sanctioned.
Freedom of speech does not mean that you can say whatever you want without others telling you that they think you are a jerk or an idiot or hateful for saying it (whether you or I agree or not). Freedom of speech does not mean that others have any obligation to listen to what you have to say. Freedom of speech does not require that the speech be spoken politely or in a manner that convinces others. It does not require that others associate with you or continue to buy your product or use your services after they have what you have said.
I have a freedom to speak; you have a right to protest me, applaud me, be bored by me, engage with me, or to ignore me.
No. Freedom of speech is NOT that a professor gets to say whatever (s)he wants in a public sphere (especially if you/we agree with it) and that a student is out of bounds protesting what the professor said in the same public sphere (especially not if you/we don’t like how it is said).
The IAC used their freedom of speech to politely request that students choose costumes with consideration of the impact the choices have on others.
A number of the professors students used their freedom of speech to express frustration about that request (according to the professor). For whatever reason they were frustrated by it. (Per Ruken it is not fair to imagine any reason why.)
The professor used her freedom of speech … well as she did. Read it how you will, doesn’t matter for this point. Agree or disagree, think it is wisdom or trolling, she had a right to express her thought.
One student used her freedom of speech to protest loudly and very ineffectively what they understood the professor to be saying (agree or disagree with that interpretation and dislike or like how she expresses it, again does not matter).
Another large group of students used theirs to write a letter in protest which explained their position on why the request for consideration in costume choice was a reasonable one and how they experienced the reaction to that reasonable request as offensive (not one demanding resignations).
The professor responds and some engage and some ignore.
All pretty classic exercises of freedom of speech.
Longing nostalgic for the polite intellectual mutually tolerant exchange of ideas that was Kent State in the 60s? Young people today … what has gone wrong with them?