The question is whether the University has the right to expel them (from the University for which they have already gained admittance) solely on the basis of socially objectionable speech.
Could a University expel students for attending and chanting at a legally assembled Pro-life demonstration? A legal Pro-choice rally? A legal political rally for Democrats? A legal political rally for Republicans?
I'm sure you'll agree that the answer is "no" to all the above examples. But, you could find groups of students on a typical college campus who would find each of these to be socially objectionable.
"People don't like that" is not sufficient cause for the University to expel the students.
Here is the OU policy?
Do you believe OU has the right to maintain such policies?
Abusive conduct: Unwelcome conduct that is sufficiently severe and pervasive that it alters the conditions of education or employment and creates an environment that a reasonable person would find intimidating, harassing or humiliating. These circumstances could include the frequency of the conduct, its severity, and whether it is threatening or humiliating. This includes physically abusing a person or holding a person against his or her will. Simple teasing, offhanded comments and isolated incidents (unless extremely serious) will not amount to abusive conduct.