There are no guaranteed ways to prevent dooring. The best one can hope for is to reduce the odds. My first and last time doored was in 1966, and I escaped uninjured, though both the bike and car were damaged.
I was doored once. I was not hurt but the bicycle and the car were. It only took once for me to figure out how not to be doored again. I guarantee anybody can also stop being doored by just not doing one thing. That one thing is to just stop riding in the door zone. It is not that complicated. There is no law, amount of peer pressure or brainwashing that can Cause or make me ride my bicycle in the door zone.