I've just thought of one:

Pay attention to his side comments when he's watching TV, particularly if he's razzing or trash-talking the characters on screen. I missed that red flag with a past boyfriend who, if I had paid attention, was clearly telling me that women are nothing but visual ornaments that exist for him to evaluate and judge on their attractiveness. Every single time a woman appeared, he'd instantly offer an appraisal. "Mmmm, mmm!" Or, "Get off the TV, ya titless broad!"

As the relationship progressed, do you think he ever displayed any respect for me as a person? Of course not. I was an object to be used for his pleasure. By the way, this is the same man I mentioned earlier in post #9, who only called or visited when he was drunk, and didn't care whether sex satisfied me or not, as long as it satisfied him.