I must confess my 7 year-old saw one of these Peppa Pig videos and I haven't seen him laugh so hard in his life. I think he is of an age where he realises this is something someone has created as a joke, I can see how a younger child would be upset.
For example, you probably have a friend that you would trip to create a hilarious pratfall, knowing that he won't feel deeply hurt by it, because he understands your intention and might have done the same thing given the opportunity even though you both really like each other. My mom is the other kind of friend who you would never ever do that to, because she could only imagine that your intention was to hurt her and make her feel bad. Trolls feast on that kind of blindness. My mom is old enough that she's beyond being able to be hurt by the internet, but now I have a couple of nieces under three, and I can't imagine what the internet will be like for them if they take after her.