I do not see any problem with him having a Pink bike, considering that I had made a documentary during school days about gender stereotyping and why Pink are for Girls and Blue are for Boys. I believed that there should not be any stereotyping for children colors and toys. I let them play with kitchen sets and all. However, I don't want him to be laughed at. And at 2.5 years old, he would not be able to understand how he should be confident of his choice even if he was being teased. I would expect the teaser to be adults more than children as it's adults that put meaning to these colors. If he is older, say 4 or 5 years old, I would explain to him that Pink is a nice color and it's nice that he likes the Pink bike but he has to be prepared to accept that there are some people who think Pink are for girls and boys should not have Pink.
My husband looked at me with some doubt. I guiltily asked Y again if he would like a Yellow or Blue or Red bike and he was still sure of the Pink bike. My husband then asked "So Mummy, do we get the Pink bike for Y?" I answered, "Yes, if he really likes it." I was all prepared to take the plunge to order a Pink bike for him when I believed he sensed that something is not right with his choice and he suddenly changed his mind and said "I want a Green bike." You can see us both heaved a sigh of relief. We continued to ask his many times if he is sure of the Green bike. He seemed sure and we had ordered a Green bike for him today.
I feel bad, I didn't like that I influenced his choice for this. Will you try to dissuade your son from getting something Pink?