Hi and welcome to Using English.
You are absolutely correct. I can feel a sense of boredom. When something makes me bored, it is boring.
People (or animals) who can feel can be bored, tired, frightened or interested.
The things/people/situations that make us feel that way are boring, tiring, frightening, or interesting.
(The is just a partial list, of course.)
Ask your boss about "Horror movies are frightened" or "Class today was interested."
If she thinks these are okay, then you have found the problem. If your boss agrees that these are wrong then the parallel situation with the romantic movies being bored should be apparent.
Student or Learner