Answer:
It might be about the cultural and societal status of different people.
Step-by-step explanation:
If you think about the phrase, "Pearls before swine" it is suggesting that a pig would find pearls useless. 'Of Mice and Men' could be implementing the rank, so to speak, of others, comparing one class of people as 'mice' and the other as 'men'. The novel could be comparing and contrasting these to levels of people or things, therefore, making it about societal status.