Well at work I was offered one and I refused it, I just asked for them to give me a machine for the platform I would be programming for.
So, I was doing on the time APIs in PHP to run in Linux servers, thus I got a Dell desktop where I installed Ubuntu 14.04 
Another reason I reject Macs is because I hate being locked to a vendor.
I care about the quality of what I buy, and I usually buy in the high end band, provided I am not paying exorbitant prices for being from brand X. Also, I don’t pay for overpriced items just to get a little more quality, and it’s not a question of money for me, because I can buy easily a Mac, and after all I refused one at work.
I recognize that Macs seems to have the best image quality, but no way I will pay that overpriced values for it, be with Apple or any other brand, but maybe I would pay if I was a designer, photographer or video editor.