I wouldn't recommend arguing with your parents but maybe you could slyly watch this video when they are around.

-------> https://www.youtube.com/watch?v=jt0iBCWzCOE (snake bytestv 10 worst advice) If they don't let you feed in the enclosure then just make the best of the situation. A lot of people still believe that feeding in enclosure causes snakes to bite at you ( which is what is happening to you ) it's just no one told my ball python that feeding in the enclosure should cause her aggression, she never got the memo, and hasn't tried to bite me once. I think a lot of other balls didn't get the memo from what I've heard here and on snakebytestv