Justin Sane (left) and Chris #2 (right) put on one hell of a show.Anti-FlagWhere: Exhibition Hall StageWhen: Saturday, 8:15 p.m.After watching the much more mellow Band of Horses, a performance I really did enjoy, Anti Flag was exactly the kind of kick-ass, high-energy, fuck-you type of show I was craving. I almost got booted in the jaw by Justin Sane, then again by “Chris #2,” and I loved it. Anti-Flag’s been around for a long time — it was recreated in its current form in 1993 — but all that means is that the band has been perfecting its art for 15 years, and they just keep getting better.Anti-Flag’s fans were almost as amped as the band.