I sometimes find myself swearing class. Some professors don’t mind it, others will give me a funny look, and some will even call me out on it and say something like “Language!”. One of my professors told me that she feels that cussing in class is unprofessional. I think it can be acceptable sometimes depending on the professor, but if the professor tells you not to cuss in class, then I feel you should adhere to it. In more laid back classes with more laid back professors, I feel it is fine.
No, it is not OK.