[GraceKrispy]

Sounds like your response was perfect. In my former school, the teachers were partially responsible for evaluating paras and reporting to the principal whether they were fulfilling all the responsibilities set before them. Maybe things are different by you, but the teachers had to document what paras were doing (to help justify the need for them as well). If that's the situation, then that email wouldn't surprise me, although I agree that the wording you've described sounds a little off.