A feminist cookie is the term for the reward some men seem to be seeking for saying or doing something feminist. Asking someone if they want a cookie may be used to mock, more or less gently, such attention seeking. A man congratulating himself on his feministic treatment of women is likely to be called out for cookie seeking. In general, feminists consider feminist behavior an essential matter of etiquette, not a cause for general congratulations and acclaim.
Bob: “Women shouldn’t go to prison for false rape accusations.”
Marie: “No shit. Want a feminist cookie?”