To look down on somebody means to make them feel inferior.

看不起某人意味着让他们感到自卑。

So, if you're looking down on somebody, you're making them feel inferior.

所以，如果你看不起某人，你就会让他们感到自卑。

But if somebody is inferior and if you look down on somebody, means you think they are less than you.

但如果某人低人一等，如果你看不起某人，就意味着你认为他们不如你。

Now, I'm not saying you're going to look down on your parents, but when you look down on somebody, you're putting them beneath you.

现在，我并不是说你会看不起你的父母，但当你看不起某人时， 你就是在贬低他们。