I know this is a late response, hadn't been online in awhile but I also had a similiar experience as a new rider. I winced as I read this because I know how it feels when you want to fit in and some are determined that you are not.

No they did not attack the color of my bike and no, its not pink. I brought up the end of a group (both F and M)ride and two of the front female riders made a comment they didn't think the big girl was going to make it - in not so nice tones and both laughed. Others nearby looked very uncomfortable and obviously did not know what to say. Yes, I know I am a big girl trying to lose the weight and I know my face was red and sweaty but by-gosh I did it and I was not going to let these two diminish my accomplishment. The adult thing to have done would have been to ignore them but I just couldn't. I just smiled and said "I'm sorry {long pause}...exercise usually helps PMS." and then went over to fountain and refilled my water bottle. I did notice after that others made a point to smile or encourage me on the ride.

There are some like this in all groups, not just cyclists, and they will ridicule anything and it really wasn't about the color of your bike or my size they had a problem with.