If it were me, I might say something like, "I'm beginning to feel manipulated. I think the answer is No, sorry I cant help this time".
What if I would rather eat from the toilet instead of having to go through it again?
Talk very softly, it makes them have to work much harder to hear you, that makes them crazy.
Im interested. So you say. "I dont have to" to yourself in your head and your not soo manipulated anymore. Huh,, i think this can help me with my life but you have to go further in detail as to what you do. I dont get it.