Comparisons are odious
Meanings of "Comparisons are odious"
It means Comparison (especially of people) is not productive and can have unpleasant consequences. People should be judged on their own merits.
The origin of this proverb/phrase “comparisons are odious” is stated to have occurred in The Debate Between Horse, Goose, and Sheep written by John Lydgate. It is stated to have been published in 1440.