Earlier quoted context omitted.
Having a daughter about the same age so it gives me a bit of insight. She doesn't get to watch TV. Her playgroup has no major bias towards pink for girls (actually even deliberate in their avoidance of such stereotyping). My wife secretly detests pink and girly stuff and is/was a tomboy at heart. We do not discourage or encourage any particular colour or style. There are no obvious factors in my daughter's life that…
If she is friends with even just one girl that likes pink, she has someone to copy from (share with, whatever). I would also guess that there are individuals that she prefers as friends in the play group (so a survey might not be very revealing).
Not saying it is likelyhood. And I agree, that majority can influence minority, especially in youngster social circles.