Firstly, I hope you don't use sarcasm like this in real life when refereeing. It won't get you far and will just cause an instant divide between you and managers. Secondly, I really don't understand why some ref's here have to take this hard-line black and white approach to refereeing. Look, I get you want to uphold the laws of the game, that's what our job is, but use some common sense. When the kids are (in this instance) 11 years old, what is the benefit of issuing a red card, especially for DOGSO? We are not just referee's but educators for the younger kids and should help them learn.
Think of the wider repercussions of being so hard-line at this age level. Once you have issued the red card, the child will then miss a future game and his parents will have to stump up £35. Some parents are single parents and will struggle to even pay this. You aren't just ending his game early for a silly mistake and upsetting the child, but taking away something they love (and maybe keep them out of trouble) for a set period of time.
I know some will disagree with me on this, and that's fine. But you need to ask yourself does the punishment really fit the crime at children's level and will the hard-line approach really benefit anyone? Discussing and educating young children is in my opinion the better option.