While I know this survey is biased, it’s people who watch Brulosophy content and answer surveys, but my own experience backs this up: https://brulosophy.com/2024/05/27/2024-general-homebrewer-survey-results/
My personal experience mirrors that as well. Everyone in my homebrew group is that. Everyone in surrounding groups (as seen in pictures of state-wide gatherings) is that. 95% of the people I see in homebrew shops are that.
Why?
The middle class part makes sense. You have to be someone who both owns their own property and also has significant leisure time.
As someone who makes meads/wines in a closet and has done so while renting, I don’t particularly see the relevance as long as your batches are small and contained… Typically, the tools and ingredients aren’t wildly expensive either if you’re keeping things simple (in the US, anyways). Honestly, I don’t see how more demographics don’t get into the basics of homebrewing. It’s dead simple to make something “passable” and with time and effort you can even make something good/great!