Intoxication

At Starbucks tonight, the following questions/thoughts were forced upon me:

What invisible, external substance do groups of individuals roundly consume in order to become socially drunk? Not intoxicated by liquor. No. By just sitting at a table with cups of water, a group that I was in close proximity to became intoxicated.

Laughing overtly. Obnoxious comments. Arguing. Singing. Odd hand gestures. Convulsions. Disturbing noises. Modulated voices.

They were drunk. Just being together was somehow license to carouse and cavort with manners no better than that of twitchy, methamphetamine abusing, rainbow coloured Shetland show-ponies.

And this was in coffee shop, not a bar.

What manner of buffoon is it that can be wholly and serenely unaware of their surroundings and the level to which they infringe upon other people by their actions? At what point is it okay to label a person so flummoxed by commonplace social etiquette an unforgivable, hopeless Philistine? An ignoramus? A dolt?