There are some concerns for some males about it, for me I don't care being skinny itself nor I see it as a good or bad thing. but it annoys me when someone commits this usual fallacy believing all humans are the same, and tries to make it looking like it's a decision. "You decided to be skinny; if you want, you're able to get some weight just like anyone. Show some will". It's sort of the same reasoning used against depressive people "Happiness is a choice; stop crying and smile, if I'm human and I can do it, you too". This may be fairly valid and easy for some people, but for others with some metabolic issues, diabetes, or another illness it's not that simple.