Can someone explain why “pick me” is an insult?

Sixgunsound

Because from what I can tell here and a small handful of other places, pick me seems to be a retort from a petulant child who is jealous of girls who can get partners while they remain lonely. If it is an insult to anyone, it is an insult to the speaker.

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1 y
I wish more women would turn it around on their accusers and shout “he did!”
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1 y

So in order to be a pick me, it is marked by dishonesty or being disingenuous about their interest in their partners activities? Someone can be lonely and honest about it and not be a pick me?
Can someone explain why “pick me” is an insult?
9 Opinion