Checking out girls while in a relationship?

Okay so my boyfriend always stares at girls when he's with me or not, and when I mean stares I mean he STARES. So I recently said something to him about it and he told me he does look at girls and thing "damn nice booty"🙄. I told him I thought this was disrespectful but he told me all guys do it and it's normal, am I over reacting?
Checking out girls while in a relationship?
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