I would have to say that your demeanor, body language, and your linguistic skill is what people are going to judge you on. If your in camo acting like a savage barbarian, talk like a gangster, or your presenting a threatening posture you might be treated different that if you were polite, showing respect and maintaining a peaceful or neutral demeanor. Alot of guys that like the USGI gear are former Military Personel. Alot of them have a core set of values. Like Honor, Respect, Integrity. So depending on who you meet, how jumpy they are, how you are acting, and where you meet. To many variables to say for sure.
i agree that it could go either way- you could be seen as a threat or someone who knows how to handle himself. Mine is military looking and i dont care. Its not camo, but green. In a disaster all hell will break loose and who has what backpack shouldnt matter. Buy what fits your need and personal style preference.
I think it depends where youre located. Myself im in a small midwestern town. I plan on moving out high profile. Molle Pack, AR-15, sidearm showing, tactical pants and boots, etc. I believe you dress to impress. If you see some clean cut guy walking down the street in a suit with a briefcase your going to assume he's a buisnessman or lawyer or whatever, even if he really isnt thats the imgane he's giving off. So if you see some guy with an assault rifle and para-miliatry look people are going to assume he's military and threatning. But like I said i live in a small town i dont have to deal with masses of hysterical people, if i was in a big urban city i would go 'grey-man' and try to blend in, just making sure i was well provisioned