Manspreading: why does the 'man' prefix always mean something awful?

Article here. Excerpt:

'Question: What's the one thing that's more annoying than men who sit with their legs too far apart on public transport?

Answer: the word used to describe it.

Manspreading might be a silly made-up word to explain the selfish male practice of splaying oneself in an antisocial manner on a bus or train carriage (or even chat-show sofa), but it has now been recognised by the online Oxford dictionary.
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But what is particularly irritating about manspreading is that it is one of seemingly countless modern words to adopt the prefix "man-". And none of them reflect well on men.

Those three simple letters can turn almost any noun, verb or adjective into something rude, sexist, vulgar, pathetic, vain or childish, as the list below demonstrates.'