If you have had damage to your room to the extent you described-it would not be caused by running a humidifier. I think 'staff' is trying to convince you that it was that so there will be an excuse to oust your plants? If you are running a humidifier moderately so that your plants are happy-it should not cause any physical damage to your room, paint or furnishings. I think you could even keep a spray bottle on hand and lightly mist your plants two or three times a day, along with keeping some water in the saucer. That would probably be enough to make your plants happy. If not, just find plants that are happy without the extra moisture and grow those-succulants, cactus, violets ect.
