Ghettoize Quotes - Hope, Justice & Emotion Sayings

Several people, not just reviewers, took me to task for writing about what they called the working classes - something I've been doing for 40 years. I thought that was contemptible - what do they want to do, ghettoize the working class as a subject? Can you only write about your own class? I've written about royalty, am I not allowed to do that?