I also know some of the trans students at the school and they certainly have. These range from not being able to get into dorms for their gender, to not finding bathrooms, to having slurs thrown at them. In one of my classes a few years ago, the head of the Women and Gender Center came in to talk about sexuality and he even said that he does not advise OOS trans students to attend the school if they have better options (he used an example of a student in Washington State wanting to come to OU)