There is a persistent myth or misconception that many Vietnam War veterans were spat on and vilified by antiwar protesters during the late 1960s and early 1970s. These stories, which overwhelmingly surfaced many years after the war, usually involve an antiwar female spitting on a veteran, often yelling "baby killer". Most occur in U.S. civilian airports, usually San Francisco International, as GIs returned from the war zone in their uniforms.
No unambiguous documented incident of this behavior has ever surfaced, despite repeated and concerted efforts to uncover them.
Or it's just "kids are assholes". Being in the same religion doesn't always protect you from assholes. In fact, sometimes that makes you more of a target!
Additionally additionally, as it says in the article, reddit sells its content to OpenAI, and in order to do that, they need it to be organic. If you feed AI output back info AI, it makes the output worse, not better. So, there's another financial incentive to ensure that the people talking on reddit are actually human.
cues*