ગમે તેની ગાં—ગમે, ન ગમે તેનું મ્હોં ન ગમે.

gamē tēnī gāṁ—gamē, na gamē tēnuṁ mhōṁ na gamē.

Literally: If one likes someone, even their backside is liked; if one dislikes someone, even their face is disliked.
What it means: Unreasonable bias makes a person overlook all flaws in a favorite while despising everything about someone disliked.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.