I drive an 18 wheeler (hog truck) and i have a lot of people telling me i shouldnt because i am a woman ?

I have been driving and loading and unloading hogs for 5 years and men still tell me that I shouldn't do it because it is a mans job. I have told a few so to speak where they could go, but what advice would u give for me to say? And I love my job especially driving the 18 wheeler!