Well, this shows just how they have failed their daughter, both as parents and as ‘teachers’. It is unhealthy to not prepare a young person for the world (particularly a public online one) which will include a fair amount of criticism - some constructive and some not so much. To not communicate with them that EVERYONE is entitled to their opinion and that if it differs from yours you can have a measured debate, agree to disagree or simply ignore it. But to get angry, throw your toys out of the pram and call everyone who disagrees with you a troll is immature and reveals a lack of educational experience ie either in school or a small group at home school children should learn how to debate and construct a valid argument, both verbally and in writing. Unfortunately they have modelled this exact same poor behavioural response to their children so how can they be expected to behave any better? Again, this reveals how their parenting and home educating has failed their daughter and makes me feel sad about how she will try to go ahead and make her way in the world.