Ive been flying F9 alot this year and it seems like boarding is always pretty much just a free for all... the agents all do it their own way. Although, I have noticed a couple of uppity agents lately that have scolded people for standing away from the scanner (probably 6-8 feet at least..) when they make the first PA announcement for boarding. Saying something to the effect of "I haven't called anybody yet, so sit back down now if you are standing up". It seems to be said in a rude and confrontational manner too usually. As if they have the right to decide if I decide to sit or stand at any given moment. Sorry, I am not a puppy-dog for you to order to sit or stand... Chill out and just do your job in a civil manner!