I feel the same way when people try to change my plans, but then, people with disabilities always have a hard time with change of any kind. Which is why I get so upset when people make plans for me and don’t tell me until the last possible minute. Or I have to change my schedule for a day.
All I can say is, stick to your guns!!!
I did. That reminds me, I need to try to schedule a choir practice. Maybe Friday would work.