Absolutely not! My son's favorite color as young child 3-4 years old was pink and then as he got older he was told that "pink is a girl's color" and didn't like it anymore. I think it's a shame to place gender stereotypes on colors and children feel ashamed at a young age for something as innocent as liking a color.
Also I know plenty of girls who like blue. I recently went to a baby shower for a girl baby and the color scheme was blue and yellow. There were super cute dresses, blankets, etc. made with royal blue and yellow patterns.