DarkKnight dude! There not necessarily anti seductive but they have there own challenges. Context can help a lot. A find a gig is mostly anti seductive but a festival isn't an usually it's even a larger crowd at festivals. A crowded night club has a lot of distractions but that's mostly the environment itself an not just specific to the crowd.
Crowds usually gather for something which is usually a distraction, crowded places usually have people in groups or meeting others so they can be pre occupied in there own bubble or distracted. Guards can be up but the environment an context all play a part.
Depending on location an context it would change. Is the crowd moving or stationary? Going to or from an event? Is it specifically a crowd or a crowded area. A crowded bar could have a lot less people than a moderately crowded street. It's not number specific but environment specific.
Also ya could be distracted yourself in such crowds which makes ya miss AI's. Some situation would give ya more subtle AI's or more IOI's.
This aside theories are: guards up, distractions, pre occupied, moving, group social context making ASD an more difficult to isolate. Happy travels dude!
