I used to know a professor in psychology who, especially while drunk, would endlessly repeat "everyone is neurotic". He would explain further that in de normal course of life, everyone had experiences that shocked, frustrated of traumatised them, and neuroses where born from that. They were quite unavoidable and while they varied in severty and shape by the time people reach an adult age they have at least a few. People without any neuroses where in his book, not normal.
As to why he would repeat this when drunk especially I never discovered if it was to say that he drank to cope with the neuroses of everyone else or his own.