You watch too much of the Slav Guns video channel.
First off, Gopnik is a Russian word and the squatting is primarily a thing in countries of the former USSR. That said, squatting is essentially nonexistent as the people who used to live in criminal colonies of the soviet union are either too old or dead. Squatting become popular for a while as a gimmick on YouTube videos. Fact is, unless you're forced to squat for hours, like people in crime colonies were required to, it is an extremely uncomfortable position.
It is far more likely the guy(could be a Trans person) is just temporarily squatting to pick up something.