It's about a bunch of pissheads getting together to get drunk and annoy as many people as possible by disrupting their day unecessarily with their out of tune "music" because "it's their right" and coz it's "traditional".
The traditional aspect is quite amusing too, the first orange order march in Glasgow was in the 1820's, it lasted for 3 years, before it was banned for the next 50 years. The Orange Order like Rangers are a reaction to the irish influx to Glasgow in the 18/1900's that's where the problem lies, there's a section of scottish society that just wont accept us..To view it as any else is a lie.
Don't get me wrong we(celtic fans) have our issues of that there is no doubt. But the main aggression comes from Rangers triumphiant attitudes and the belief we don't belong. FFS just look at the amount of celtic fans murdered in recent years. look at the uefa categerisation of the rangers as opposed to celtic, look everywhere they go, ffs look at what they did to manchester, look at how we were welcomed and commended in seville with similar numbers..It's very easy to spot the differences if you look beyond the media line of 2 sides of a coin.
In the end up though, it's not half as bad as it once was, it gets reported alot more, the OO is dying on it's arse and with that Rangers are slowly getting better, the last remnants of them are getting a bit of a siege mentality about them though as they know the writing is on the wall. Wounded animal and all that caper.