The thread is not about people needing or liking to be challenged. it's about men who say that they want a woman who will challenge them. These are different phenomena.
Loving GD's 'comfortable in herself' contribution - which I think is actually the key to this issue. My conclusion, after getting to know the second Mr 'I like you, you challenge me' fairly well (but not going quite so far as to date him), was 'actually, do you know, I think what I'd really like to do now is further my own intellectual development, so that I can challenge myself, fulfill my own potential and feel completely comfortable in myself, my views, arguments and abilities. No fatuous flattery required'. So I did.
I'd thoroughly recommend that any man who feels the need to be challenged does the same.
The question is whether he actually wants to be challenged, to the limits of his abilities, by academics who are far more capable in their subject than he is; who will point out the flaws in his arguments, who won't always award him top marks, or express awe at his greatness.
Someone who genuinely wants challenge, with real intellectual curiosity, someone who is comfortable in himself, would love this. Someone who just wants a buzz about feeling right all the time would not.