Words.

I can't believe that I even have to say this and stress on this separately. Never, ever, ever make a negative comment on people's appearance. Especially if they're children. Especially if they value you and look up to you. Especially if they consider your opinions to be true. Don't do it to them. These words that you think are just intended for fun have the potential to get etched in their hearts forever and ever. They will lose their self confidence, they will live their lives believing there's something wrong with them for the rest of their lives if you say what you say often enough. It's not for you to make comments on people's appearances and you have no right to degrade someone based on their appearance. You have no right to degrade people anyway. Be mindful of your words, watchful of your actions. Be present, and be responsible, always. Especially when you're around children. They're children, they have zero negative thoughts going through their minds and do not be the reason one of those thoughts pops through their minds. Do not be that person. I beg you. 

Love, peace.