Interested in reading a book but don’t want to support a badly-behaved author or even give stats that show interest to their publisher?
Buy used, preferably brick & mortar. It doesn’t work for e-books, obviously. But anything you can physically get your hands on, only the initial sale counts for royalties. And unlike giveaways, it doesn’t show the publisher that there’s any demand.
ETA: what you do support is a local business, and your community.