The meaning of the phrase was "I accepted those as you presented them, without contention." Honestly I've never heard "take at face-value" used in anything but a neutral way, and in never occurred to me that someone might be insulted by it.
Anyhow, since I've only gotten the ol' runaround seeking plain answers above, I'll have to do my best with this:
"If the downvote has anything to do with mathematics then I'd be very grateful to know more so that I can improve it if need be."