Boyfriend very obviously looks at other women, am I right to get mad?

[Brenda]

I am well aware that everyone looks and checks out other people. It's human nature. And I know that it just doesn't go away just because you love someone. But shouldn't it be less obvious? Like today for instance... We went out to eat and the cashier was very pretty and my boyfriends "type". I can tell when he thinks a girl's pretty, he gets nervous. So I use the restroom while he picks the table... One directly in front of her and proceeds to stare at her on and off through out our meal. I am wrong for thinking that is rude?
He also seems obsessed with beautiful women. He "likes" about 100 hot women pages on Facebook so his news feed is filled with them. So is his computer photo album. Is this just a guy thing and I'm being insecure or do I have a valid argument here?
Thanks