My boyfriend thinks it's gross to kiss after a bj?

I was busy sucking him off and he came inside my mouth, and being the good gf that I am, I swallowed all of it. Feeling a bit romantic, I stood up and tried to kiss him. He stopped me and said ew thats disgusting to kiss. I thought it was a joke and I continued on. He said stop! so I did. I asked whys it disgusting? and he said cause I came in your mouth. I laughed and said but I spent about 10 minutes sucking, and then swallowing, whats the difference? he said cause your a chick, so your meant to have c*m in your mouth. is that weird?