The difference is that OKWU markets itself as a Christian university; its stated vision is "to provide a thorough and sound education within a Christian philosophy of life" and education "in the light of Christian principles." Its student handbook clearly lists tobacco, drugs, alcohol, porn, and premarital sex as unacceptable.
It should not be any surprise that if you are found to be engaging in any of those activities--which you and I may think are fine, but OKWU clearly does not--you will be disciplined and perhaps even kicked out. OKWU could not be more clear on this point.
In contrast, Yale and many other universities claim to embrace free expression. Yale informs incoming students: "Yale’s commitment to freedom of expression means that when you agree to matriculate, you join a community where “the provocative, the disturbing, and the unorthodox” must be tolerated. When you encounter people who think differently than you do, you will be expected to honor their free expression, even when what they have to say seems wrong or offensive to you." http://yalecollege.yale.edu/new-students/class-2019/academic...
So OKWU may be many things, but it is not hypocritical. If Yale and these other schools do not live up to their own freedom of expression promises, they are.