I agree with Bramwell. It's a variant on the common phrase 'Like attracts like', which means that we tend to be drawn towards people who are are similar to ourselves. Here, the noun 'like' means 'things' (or people) which are similar'. The title is kind of word play, but the meaning is clear - we like people who are similar to us.

It means that people who are similar tend to like each other. People or things who are similar are like each other. It is a pun on the two meanings of 'like'

weird. Who knows!!