If a man cooks, its art! And if a woman does, its her duty.. she HAS to do it.. why?

If a man stays at home and takes care of kids, he's a GREAT husband.."because he is selfless"! And if a woman does.. she's just on her duty! Its no big deal.. why?
If a man cooks, its professional, and artistic..
if a woman cooks, its just her household duty.. why?
If a man cooks, its art! And if a woman does, its her duty.. she HAS to do it.. why?
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