That just shows one form of hate that can teach a kid to be hateful from the beginning of their life. Adults see hate everywhere also. Movies, television, and songs are all hate filled. There are love songs, and movies, but then don't have mass appeal. I haven't seen a love centered television show.
Hate is also more appealing to the majority of people.
If I tell a little child to love something they are usually hesitant. Adults are usually hesitant either way. Though you can get a lot of people to believe in hate, their beliefs are shallow. In love you can get very few people and their beliefs are deep and unwavering. Hate's superior numbers would easily out-do love's few believers.