An interesting experience perhaps illustrative of this. I was shopping and looking at one of those racks with 4 sides full of goods. I was about an arms length from the rack, taking off things and looking at them. A young but adult hight teen male detached himself from his mother to look over the rack. He was circling the rack apparently looking for something because at each side he said “No.” When he got to my side he squeezed between me and the rack to look it over and said “No.” Then he went back to his mother and she chewed him out for being so rude. I hadn’t noticed anything unusual or rude about it, although in my regular state I would have noticed and might have reached out to clothesline him as he raced by.
The IG does seem to lower the “fear factor.” It sends out a message that it’s ok to come into the personal space. I’m not sure I’d characterise it as a lack of respect though. If I’m wearing the IG I’m not worried about defending the space and the other folks are ok in it.