Bf rubber necking

​My boyfriend is a chevy truck fanatic so if we're mid convo he'll check one out as it goes by.   Im okay with that.  What I'm not okay with is last night as we sat in the parking lot talking, he was more focused on the girl in the car next to us.   Should I not be upset over this? I mean he'd glance at me for a second and then glance at them for like 30 seconds straight.  And then after a few minutes I spoke up.   Said that its nice having a convo with someone whos too focused on a car that he doesnt even like.... because of the women in it. He denyed ever even seeing that car.  And I mean it was really obvious.  :/