I have no idea what that video was about, but it does imply that silly hats encourage weird behavior in adult males. Was this a religious thing, or a fraternity initiation? They all looked so serious, except for one guy in a RED hat that did a lot of gesturing, smiling and seemingly encouraging the others on. The rest of them didn't seem to be enjoying it that much. But not knowing the customs, I could never guess which one would be considered the weirdest one in the group.
A Sufi gathering probably, Central Asian style. All men bearded so pretty fundy. People of Turkish ethnicity, living NE of Turkey. Not unlike the Whirling Dervishes. The groups leader would be a sheik or pir. Jewish men, and Catholic leaders, wear beanies ;-) At our synagogue, we sometimes do a circle dance, mixed age and sex. Greeks of course have the syrtaki.
In the US, in the 1990s, this would be called a Promise Keepers gathering. The 19th century White Americans were scared by similar behavior, by the Sioux participating in the Ghost Dance movement. Part of the reason by Gen Custer, as part of a three prong Army suppression, went to attack the Sioux.