He doesn't seem to care about other people's opinions at all.
Such a trivial matter is not worth paying attention to.
within the eye
Original literal meaning; now rare and mostly found in classical or explanatory contexts.
Literally, 眼中 refers to the inside of the eye, but it is hardly used that way in modern Japanese.
out of consideration; not an option
Compound of 眼 (eye) and 中 (inside). The figurative sense of 'within one's consideration' developed from the literal 'within the eye'.