Most men know at least on some level that they are completely inferior to women in almost every way. They degrade women because they lack self esteem and couldnt get a real date to save their life, it's a way to even the scales and mentally get back at all the women who have shut them down in reality. They can equate the woman with a toilet lid over her head with the woman who laughed in their face and feel a sense of power and control over something that rejects them as useless and inferior.