I've been through all the stages. The first one was to get all worked up and get in a fight with the guy and get all physical and usually I won and it felt great. After some physical injuries I went on to the second stage which was to act cool and not care, but it subconsciously bothered me that I'm physically unable to fight (and protect my lady) anymore due to serious injuries from sports. The last stage is to listen to what Sire says and avoid girls that want to go to a club to dance the night away. Most girls that are truly worth a long term relationship wont even care about small things such as going out to dance, there are plenty of other things you can do.
If you and her both want to go I feel your pain, because you're going ahead with the plan to go out there knowing very well the other guys will be there ready to hit on her. When I was physically able I had no issues with this and anybody strong usually doesn't (not saying you are not), but like I mentioned earlier if you're unable to handle it mentally just avoid that scene and explain it to your girl and if she can't deal with it then I guess tough luck for her. Try suggesting to her a dancing class if you both like dancing so much, usually couples go and it's pretty chill compared to a bar or club. And you can take her out to a nice restaurant afterward and get drinks, so there you have it dance + alcohol with minimal trouble and drama.
I'm only mentioning being physical, because I know how those AFC sh1t heads can get, they don't get verbal communication and start getting physical or persistent and the only way to deal with them is violence, works nice when you crack a half filled beer bottle on someones head, that sends the message across nicely, but really... avoid all this.. find somewhere else to go, why go through all the trouble, is it worth it?
Everyone that says act confident and play it cool obviously doesn't understand how irritating those *******s that wont listen to words get. I hear you though loud and clear. Remember that by avoiding these places you're not running or being weak, you're simply choosing not to be around *******s that label it that way. They label it this way because they want you to get worked up, they are haters and are jealous of what you have, they want your girl, and when you don't bring it to them in their little hang out scene you're labeled weak or a runner. It's not true, don't let their crappy mental games get to you!
Look at it this way, you and your girl are choosing to go to a minefield, you either walk over them or walk around. You may say, why do I have to walk around? Well you can't be idealistic, you know what goes on these places and with the information you already have you then make a decision, do battle or take it easy. Choice is yours.
P.S
Great responses from hitop and LatinoMan, big up!