It was 28 years ago. Both my future wife and I had just spent a year in yeshiva in Israel. We were young and idealistic. As we were planning the wedding, the subject of seating at the chupah came up. My wife and I wanted separate seating for men and women, as advised by our rabbis. My very liberal future in-laws were incensed. They told us in no uncertain terms that they would not be separated during the service. I couldn't understand at the time what the big deal was. You can't be separated from your wife for a half hour?
Fast forward to the present. Our neighbors here in Rehovot are very nice people. We aren't real close friends, but we're good "neighbor" friends, so to speak. We were invited to their daughter's wedding. The family is dati leumi, national religious, like most of our neighbors. The girl is engaged to a yeshiva guy, with a big kipah srugah. Although no mention was made on the invitation, I found out that the whole wedding, including the meal, would be separate for men and women.
Although my wife will be there for the chupah to say mazal tov, I decided not to attend the wedding. About 3 months ago I attended a similar separate simcha, and I left early, feeling awkward and somewhat offended. I decided then that I would not go to separate seating weddings.
When I attend simchas, especially of those with whom I am not very close, my wife is my companion. I have to sit through a long meal, with music so loud you can't talk, and I like to be with my wife. So why do they force married couples to sit separately? Because they are afraid of the single boys and girls mixing. I think that this is really obnoxious, dumb, and inconsiderate. There is no halachic requirement for it, either. It is just the latest example of pseudo-frum heredi practices polluting the modern orthodox world. I find it offensive and primitive. It is saying that the men can't control themselves around women, and therefore keep the women out of sight.
I suppose that if this was a wedding of a close friend I would have to swallow my lumps and attend. But otherwise I feel no inclination to go to such an event.