There is a good side to this. Think of all the kids in the school who instead of being raised to believe that eating meat is simply normal and not to be challenged are being taught that this is a matter of moral debate on which each person should form their own opinion. That is a step forward. The long term benefits will be large. I think this school has probably done more for the animal rights movement than most other schools that just carry on teaching their students without having a serious debate and I hope they don't get too much abuse from vegans.
If the purpose of the animal rights movement is to be effective in reducing animal suffering rather than morally pure, then this kind of thing may actually help.
As a general rule, anything that leads to polite debate ought to be beneficial if you have the truth on your side.