You see this advice get thrown around an awful lot. It seems to be a common piece advice among blue pillers and red pillers that you need to learn to be happy by yourself (i.e. not in a relationship and/or not having sex with someone). It's given out mainly to people who struggle to get dates, relationships and sex.

Do you believe it's good advice to give to people? To me it seems like a bit of a platitude to keep ugly and undesirable people in their place, give them false hope and keep them as productive members of society. Maybe I'm wrong though. What are people's thoughts on this?