I am sure that if I asked you, were you a tolerant and understanding parent, I am sure after reflection you would say, Yes. What may surprise you is that every family is different in terms of what they tolerate and what they believe is acceptable behaviour. What our children experience when they visit other homes, especially their friends are a whole set of different expectations and understandings. This is quite a learning curve for children and sometimes they will reflect on what they see and learn and not talk much about it at home. The difference at times can be quite overwhelming.
It is natural that children compare how different families operate and they are particularly curious about the degree of tolerance and freedom shown in other homes. They will compare and be interested in how their home experiences differ from other families. This is a time when they are reflecting on how happy they are in their family compared to other family situations. This is a normal part of growing up and learning about how people operate and perceive what is important in their life.