One fan wrote: 'I don’t like when little boys have long hair, and they are too small to decide if they love it,' with another adding, 'It's like they wanted a girl but when they got a boy they make it look like girl.'
However, fans of Timberlake's rallied behind the singer to defend the parents decision.
One asserted, 'What concern is it of yours? People like you are the reason celebrities don't like putting pictures of their kids up.'
'He can make the decision to cut his hair when he is older. There is literally no difference. Hair has nothing to do with gender,' another added.