I have had some. If I choose to respond, which isn't very often, I usually follow it up with a, "Have you used one?" question. If the answer is no (this is 99% of the time), I end the conversation there. If the answer is yes, I will sometimes listen to what they have to say.
I'm not one to get into a philosophical discussion about computing preferences; if Windows works for you, I couldn't care less; if Linux works for you, again, I couldn't care less. I'm comfortable in my choice, and I'm not out to convince anyone that it's superior when, in some ways, it isn't. Evangelists often give their peers a bad name, and I'd never want to to do that to you people.
My boss strongly dislikes Macs, my coworker is indifferent but with a slight disagreement toward them. Most people simply don't care.