Freedom of Speech, Except in Colleges

In the news today is a story of a college professor stopping a student in the middle of a speech, calling him names, and not letting him finish because (it is assumed) the topic did not fit the professor's political philosophy.  I'm not sure that surprises anyone, since most of us who attended college have similar stories or saw such an incident.  Of course sometimes it doesn't register, because we might have agreed with the professor.  I saw one comment which while agreeing the action of the professor was wrong tried to make the argument that churches are tax-free entities (like public education) and "christians" would not allow anti-christian speeches in their churches.   There are a whole lot of problems with that line of argument.  First of all, some churches do debate issues and bring in authorities who argue an "anti-church" line of reasoning and are treated respectably.  Secondly, independent of its tax status, a church is under no obligation to give the pulpit to anyone who would like to stand up and say something, pro or con on some pressing cultural issue.  A church may control access to the pulpit, and it has that right.  A professor who gives a speech assignment should not be able to decide on the basis of political correctness what speeches are okay or are not.  A professor can control the "pulpit" in regards to certain demands that should be incorporated in the speech, and should be able to stop the performance if the student fails to meet those demands (thesis statement, main points, arguments surrounding the main points, etc).  But to compare a university to a church, because of tax status, is a faulty line of reasoning.