one reason why guys are dumb

so, what's not impressive? when i'm driving somewhere with a guy i'm "out on a date with" and he proceeds to get on his cell phone and have a conversation with someone else! and not just a "hey, i'm out with someone right now, can i give you a call back later," but a whole 10 minute conversation! which leaves me sitting in silence just getting kinda pissed off. this has happened to me with the last 2 guys i went out on a date with.... i mean, helloooo, what's the deal? not a way to make a great impression, by ignoring me.