A couple years ago when Nico asked if he could shave his head bald, I said sure, it's only hair, it will grow back.
So off came it all. The next couple weeks were horrible for him. He was teased and picked on for the first time in his life. People looked at him differently, and treated him differently because he was bald. But, like I said, it did eventually grow back, and I think he learned a lot from the experience. You can't know why it's not right to pick on others, until you have been picked on. Whenever he starts in about the way someone else looks or acts, I remind him of how he felt during that episode of baldness. He didn't like it, not one bit.
Fast forward to the present. The other day he asked if he could color his hair blue. Of course I said yes, after all it's only hair! Since Nico was doing his hair blue, Lucas wanted to color his hair red. They were out of the red hair dye though, so Lucas settled for purple. We applied the color last night, and it looks great! The purple on Lucas looks almost natural. The blue could never be mistaken for natural, but it totally fits with Nico's personality.
We haven't yet left the house, so we haven't encountered other people (friends or strangers). I'm not sure how others are going to react. I do know, good or bad, both boys will likely learn from this experience, just as Nico learned from his past experimentation.