Avoiding taking in the comments from the poster of that, it doesn’t sound like it was a horrible idea.
For a minute or two, let’s stop thinking of it as “Segregation”. Schools always have students divided into different groups – age, the first letter of their last name, their grade level, etc. Why should we even care if they’re divided by skin colour? Being upset by that just makes us guilty of being racist because we’re offended by something that shouldn’t even matter.