Open Rebuke is better than secret love, says the scriptures [Pr 27:5], but it is not saying that open rebuke is best or that it is even loving.
This is a proverb, and as a proverb, it is imparting wisdom by juxtaposing something bad against something that sounds good. In this case, secret love is not as good as an open rebuke. This is in no way saying that open rebuke is better than love. The secret of this proverb is in the opposing of secret vs. open. It is saying that even something as bad as rebuke is better than love if the love is hidden (in secret) while the rebuke is exposed (in the open). That is the wisdom here. To misuse this verse as an excuse to openly rebuke people is not the peaceable wisdom that comes from above [James 3:15-17].
Open love is better than any rebuke. Open love is best, it is the most excellent way [1Cor 13]. Where is the open love?