Why do majority of men believe women can't do half as much as they can?

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I own a General Contracting Company with my husband and I have come across tons of men that can't believe I work for the construction industry. Many times have I won bets that men have challenged me, saying that I can't hang drywall, or frame a house etc. I prove them worng. Another topic is playing sports. I am 29 yrs old and still play many of the sports I played growing up. Football, baseball, basketball, golf.... why do men get offended when I play along side of them. There are many men out there that actually get mad when a women does one of "there things". Why? We don't get mad when they do one of "our things" (i.e dishes, laundry etc.) I don't understand? Will someone please explain this for me so I can understand this a little bit better.