Wireless is mobile, devices connect, users interact. Go with the flow it is proper Netiquette. Do follow the culture around you.
When using wireless devices in public users must follow the culture of the crowd as well as online users. This can mean putting your device away if it is not socially acceptable to be used.
At hotspots smartphone Wi-Fi use is always acceptable. Tablet use is expected sometimes. Laptops should be used occasionally. Any more is over use.
Follow the cultural norms of the crowd around you because humanity comes first.