This is the beginning of coersive control.
He is clearly afraid of new technology. Nothing wrong with that many of us are. However, you have a right to exercise your wish to use your part of the joint subscriptions, or not, using the new gadget. I suggest that you get someone in to sort out the situation and write down the instructions. The next move would be to get an equally good TV to use in a different room. Holding up your hand with palm facing towards him and saying "No, this is unacceptable" is a very powerful psychological statement, it cannot be misunderstood. It will also shake him to his core. Then you get to say what you really want.
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