Guys how do you feel when guy's whistle at your girlfriend right in front of you?

today I was with my boyfriend and a group of guys were walking out as we were walking into my building and they all kinda whistled at me when we walked past and my boyfriend got really pissed off and kinda stared them down. I'm just curious as to what goes through a guys head in a situation like that.
Guys how do you feel when guy's whistle at your girlfriend right in front of you?
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