There have been a bunch of studies done that say loneliness impacts your health and overall wellbeing.The desire to identify with and participate in any community (other than for physical survival) is immature and vulgar.
So technically by your definition no one is vulgar or immature because loneliness does affect physical survival. It impacts health and affects physical survival. In 2023 the surgeon general issued an advisory about the impact of loneliness and how it affects health.
So getting into a group of friend literally impacts physical survival. Also as someone that had to suffer intense loneliness it did impact my health greatly so going out and trying to be part of a group was a literal survival strategy