Parents should teach their kids manners

This generation a lot of the teenagers have no manners and no respect for the elders. I see teenagers push the elders and curse them out. Is it the parents fault? Yes it is. If the parents don't teach them or correct them. Who going to teach them right and wrong.How will they learn from there mistake. Growing up when I saw my parents friend I would have to call everyone auntie and uncle out of respect. If i didn't its really disrespectful.  I would get a lecture from my parents all day long if they found out. A friends's friend said to me do you really want to have a kid and worry about how they going to grow up in this generation. He said that's why he and his wife decide not to have any kids.