Society is organized in a manner that gives preferential status to males; most positions of authority are occupied by men.

(basketball) A defense in which each player guards a particular opposing player.

Humans prey upon one another.

plural of man-to-man defense

People have differing tastes; what pleases one person may displease another.

What is useless to one person is valuable to another.

(uncommon) Alternative form of one man's meat is another man's poison.

(uncommon, humorous) Alternative form of one man's meat is another man's poison.

Some people's misfortune is other people's fortune.

Fried meatloaf. / (colloquial) Bread dipped in gravy.