Manlet isnt defined by weight, no .matter how much you want to believe it. I cant name a single top LW fighter who I would say is short enough to warrant the manlet label.
Matt Serra is most certainly a manlet.
I think I have more experience calling it cause Ive been a very small manlet my entire life and was obsessed with height and measuring height.
A lot of people overestimate the size of the average everyday healthy guy in developed countries.
People that are 5'7"-5'9" can look quite normal with the right proportions...
Joe Rogan, Jeremy Stephens, Conor McGregor, Eddie Alvarez....all look on the short side but are not extraordinarily short like FLWs