I'll take either one over the folks who have loud conversations about anything and everything before the ballet and then again during intermissions.
Well, loud/profane/etc. is not really ever good, but who cares what others are talking about before curtain and at intermission? I mean, yes, it's lovely if your neighbors bring you into a performance-related discussion, but when I attend the ballet with friends (or see friends there), we often use the intermissions, etc. to catch up on all manner of news--travel, kids, work, ballet class... Why this should concern anyone else is beyond me.
As for leaning: a most interesting and enlightening discussion for me.
I sit in the front row (orchestra) whenever possible as I strongly prefer that vantage point. On one occasion, though, I was in the balcony in NY and I leaned forward and was immediately asked not to. I complied, but found the request very puzzling at the time.
Cute story about the KCen: my front-row subscription seat is near the center, behind the conductor. At one of last spring's performances of Sleeping Beauty, a woman was next to me with a tiny girl, 4 or 5 years old. When the conductor came up to face the audience before each act, he was pretty much eye-to-eye with the little girl. Before the first act, his look seemed to say "I hope you behave but I'm a little skeptical". But she held up magnificently, and she got a little look and smile from the conductor before each subsequent act.