what about "On nie lubił ciebie"?
Valid enough to accept it, but as it usually is with putting 'ciebie' at the end, such emphasis is not common.
But on nie lubil cie wasnt accepted = crap
Why was 'On ciebie nie lubił' not acceptable?
Seems a bit less natural to me (stronger stress on "you"), but good enough. Added.
On cię nie lubi
That's Present Tense, we have Past Tense here.