Why is it that male gynos always suggest you're making your female pain up or that it's all in your head?

I have endo, adenomyosis and PCOS, surgically proven, and am still dealing with the pain. Now of course, the adenomyosis diagnosis is not 100% accurate because they say the only "real" way to know is to have it taken out. But it's suspect from my laparoscopy. Anyway, I have been floated around to several different gynos, and all but 1 were men. My husband is in the military and we move around, a lot. Each time we are restationed I have to check in to the hospital, explain my situation (and why I am on Ultram and motrin and sometimes vicodin) bring them my surgical report and sit there while they do another "exam" on me and explain that my pain can't be caused by what I say it is. Yesterday's male gyno suggested I may not really even have endometriosis, despite what the surgeon noted, and wants me to do ANOTHER pelvic ultra sound. (Those aren't fun, you have to drink 32 oz. of water before). What is up with these guys trying to make me feel as if they know more and I am not hurting?