First of all, welcome to the forum.
My opinion is that if someone is riding a bike or enjoys cycling then they are ok in my book no matter what type or brand of bike they are riding. Keep riding and have fun. Don't worry about the others.
I started riding in '94 on a $90 Huffy and surely received my share of bad looks from cyclists on pricier steeds. I hate to say it but it drove me to be a better cyclist. I always wanted to pass or drop those who felt superior just because my bike was a cheap model.
Everyone has to start somewhere. My friends and coworkers have asked for bike buying advise many times. I always tell them to buy from a bike shop if they can. If they cannot, then buy the best you can afford from the x-mart and let me look it over so it's safe to ride.
I picked up the cycling bug after watching a local race and I couldn't wait to save up the money to buy a good bike. I got one a couple of weeks later with the money leftover after bills and rent were paid. I was in love with cycling. I lost 30 lbs, got in great shape and found a passion that stays with me today.
Forget about the looks or comments about your bike. Enjoy it and what it can do for you. I believe most here would share that feeling. If you have any questions feel free to ask. This is the best forum I've found for everyone from newbies to racers.