I think a lot of it has to do with how you carry yourself and the confidence you have. I think people treat you how you allow them to treat you.
Comments I get:
Lunch - You're so good, you bring your lunch everyday! I wish I was that organizedナ.OR I wish my leftovers looked as good as yours, etc.
Weddings - As women are talking about their lavish weddings (or their offspring). When it gets to me I say, "Justice of the Peace, 12 bucks, been married 23 years. I like a drama-free life." They can't argue with 20+ years of marriage.
Cars - I drive a 12 year old Ford Focus (my colleagues all have new luxury brands). "Wow, your car is so clean" - "Yeah, I take care of it." I have never had anyone tell me I should upgrade.
Cable - My coworkers are talking endlessly about all the shows they watch. Me: "You guys are crazy, how much time do you spend watching TV for Pete's sakeナ". If anyone says, "what, you don't watch TV?", I'll say something like "no, I have a life, don't need to watch other people having one" - always said in a chiding friendly way.
Gift Giving - I don't say much here unless directly asked. I typically say, "no not really, anything my hubby and I need we just pick up throughout the year. We prefer to go low-key for the holidays, less stressful that way. Besides I'm a lousy gift picker-outer"
Kids - We don't have any (I'm in my 40s). I have never had a co-worker ask me WHY I don't have kids. When exchanging first-meeting pleasantries and people ask about kids, I usually say something like, "No, we preferred to go the dog route instead" - said with a smile.
The key is to not make your response defensive, more just matter of fact. Maybe all my co-workers and family are just tactful, but I have never had anyone question or comment on my lifestyle. ナ.or maybe I give off the air of a real bitch and they're afraid of me :) I like to think that it is just an air of confidence.