In life you come across all sorts of people, nice folk, and not so nice folk, all communicate in different ways, some use subtle hints, and words of wisdom, others can be straight to the point verging on rudeness
My guess is the tutor/college is trying to steer you in a new direction, rather than laying the law down big time about banning urbex. Really you have two choices, take the advice and develop a new subject, or stay as you are and get the boot anyway.
Just because you think a subject isn't boring or not good enough, doesn't mean everyone holds the same view, your not marking your work, and your not paying a salary for it, and really that's what it's all about at the end of the day. We'd all love to do the things we love in life for a living, the truth of the matter is very few do.
Dwelling on it is only going to keep you irritated inside, let it go and spend your energy on looking at new ideas and creations