AIBU. It annoys me that when people want me to help them to do something they don't just say, "Could you help me with xyz on Friday" they say, "Are you doing anything on Friday".
I am hardly going to commit to saying yes or no until I am clear about their expectations. I may not want to help with that specific tasks even if I am free. On the other hand I may feel that it is worth changing my plans if I feel that the task is really important.