Question:
Hello to what extent can I say on websites how I disliked a school run by Jews without being over lashon hara thanks
Answer:
It is not loshon horo if there is a positive benefit or gain to others by writing what you think about the school. But you have to be careful how you word it i.e. not to exaggerate (the Chofetz Chaim enumerates 7 conditions!)
Sources:
Chofetz Chaim Hilchos Lashon Horoh 10:2