Yes but rather than wallpapering your kids to make them fit in with the bullshit teach them the language to stand up to it.
Model that so it seems normal.
My 7yo dd rocks a pixie cut. We moved to a new estate and within hours of her playing out in the garden the kids were asking was she a boy or a girl. When she replied she was a girl they asked why she had short hair then she responded ‘my mum says I can have my hair however I want’
She is regularly mistaken for a boy and isn’t phased in the slightest because I have never made a big deal out of it.
If you know your son will love a turquoise bike get him one and help him stand by your choices.
If you know he is going to feel awkward and embarrassed riding it then don’t waste your money.
As a compromise how about encouraging him to cover it in stickers which will break up the color and diminish its resale value and therefor likelihood of theft.