In Mexico and in many South American countries, Son of Bitch is only one meaning of the word. Another very popular meaning is "male whore." And the vast majority of male whores are either gay or service gay men. This is happening in Mexico, not in countries where it isn't used that way.

It's so prevalent that when you do a Spanish to English translation on Duck Duck Go, puto translates to "gay." On Google translate puto goes to "fucking," so there is no one definition for it. Puta has 10 different definitions listed, including hooker, slut, prostitute, tramp, and dyke... so it isn't a stretch to see why the masculine form of the word can mean male whore.