Must I? We clearly don't talk to the same people, then. Not only have I never judged someone or something based on what web host they use (seriously?), I've never heard anyone say or intimate that they would, either.
I'm completely in agreement with you. Unfortunately I've been to a handful of tech meetups where I've heard this exact phrase. It's like they look down on me for using windows :( I dunno, maybe it's my limited perspective but I've actually been feeling like I'm not taken as seriously when I show up to tech meetups with my thinkpad.
Reminds me of my favorite Mac Joke though I think it could apply to Linux folks too so feel free to swop it out. ;)
"How can you tell a Mac user? Answer: They tell you"
A network support guy laid that on me a few years back, I thought it was hilarious because it's so true. I have since stopped mentioning I'm a mac user...