There's a negative stereotype that Transpeople kill themselves all the time, studies have shown this number to be dropping and the suicides to be caused by abuse from others and denial of transition related care.

The Far Right ignores this and goes "Lol transpeople kill themselves because transpeople dumb"

So it became a thing to report anyone Trans on Reddit, for "Suicidal Behavior", which Reddit never looks into the validity of, they just send you a bunch of suicide hotline links... which is well intended, but there really should be a mechanism in place to find out if they're trolling.

Eventually when it became common knowledge that it's so exploitable it became a more in general method of griefing others.