The first couple of chapters discuss conditioning and how people are genetically manipulated and mentally conditioned to accept and observe the beliefs and caste system in which they live. Lenina is a Beta who is conditioned through hypnopaedia during her toddler years to not like children from a lower caste system than she. The words that are piped into Beta children tell them what other children "beneath" their class wear. Then they tell the children what type of attitude to have towards children of lower classes. For example, the recordings for Betas say things like:
"Delta Children wear khaki. Oh no, I don't want to play with Delta children. And Epsilons are still worse. They're too stupid to be able to read or write. Besides they wear black, which is such a beastly colour. I'm so glad I'm a Beta"(30).
Ideas like this are taught to each class of children and since that is what they hear the most, that is what they do, think, and feel. Huxley proves this later in chapter four when Lenina is on a date with Henry and they are flying past the Brentford's Television Corporation's factory. A shift was finishing up and Deltas and Gammas were filing out of the building and waiting for the monorail tram-cars. Lenina notices their behavior and the color of their clothes and off-handedly says, "My word. . . I'm glad I'm not a Gamma"(75). She didn't have to think about what she said at the time and she didn't think much about it after she said it. Saying something like that without having any remorse or real understanding about what it all meant proves that Lenina is properly conditioned to live in the society without questioning it. She never uses reason or her own thoughts to discover anything new, either.