My advice is, if you connect the spigot, turn on EITHER the cold OR hot water tap, but not both. Make sure to manually switch from using hot water to cold water once the main wash has finished. If you want to wash with warm water, fill the tub up 1/2 way with cold water first, then 1/2 way with hot water second.
The problem is, if the cold water line has less water pressure than the hot water line, the hot water line could backflow into the cold water line. This is especially true of multi-story apartments that don't have a booster pump on the cold water line.
A friend of mine who lived in an 20 story apartment building was told by the landlord that people were getting scalded because the toilets were flushing with hot water. He was politely informed to use either cold OR hot water taps with his machine, not both.
So, Countryguy, Your landlord is actually telling the truth somewhat, but threatening you with eviction is a bit harsh, especially when a little education would have gone a long way.
If you really want to avoid the whole entire issue with hot water backflow, just buy yourself a used twin tub machine and fill it manually using a hose from the tap. The upside to using a twin tub is that you can wash the clothes, then hang them up to drip dry if you are doing laundry late at night.