I'm a straight white male. What is diversity?
It's the core of the reason we can't have equality and also the rallying cry for people who want equality.
It's a dividing line used to decide who is in v. out from many, many different perspectives.
It's a religion, and a rallying cry for people who want religion to have less, or no influence on public discourse.
It's a very fluid concept depending on what the speaker believes and what the speaker wants the listener to believe.
Most of all, it's a hot topic.