Is this a red flag?

Sometimes I give my bf a handjob while we are watching tv, just today, we were watching an anime show, we were at a scene showing only men. He moved my hand away, and told me to stop. He said it makes him feel like hes gay. He told me that whenever i give him a handjob while we watch tv, it makes him feel like hes masturbating to whoever he sees on tv. He told me he doesnt mind if it shows women, just not men. I remember there was a time he wanted to have sex while we watch tv, and i ask him if he was thinking about having sex with those women on tv when we had sex, and he admitted to it. Its like i never existed and he thinks about having sex to whomever he sees on tv whenever i give him a handjob. Now im questioning if hes even mentally there whenever we had sex. Is this a red flag?