Even if people say "kys"/"kill yourself" as a joke
It typically isn't funny to the person it is being said to, as the joke is typically targeted at people with physical and/or mental disabilities.
Now the only circumstance in which saying "kys"/"kill yourself" in a joking manner is if the recipient of the statement tells you or a group specifically that it is okay with them and that it doesn't actually bother them.
However, a good portion of the "kys"/"kill yourself" comments to spesific users are genuinely telling them to kill themselves and that can actually damage the recipients mental health or make them actually kill themselves and then the blood is on your hands and you will be charged with suicide promotion (which is actually a crime and you can get jail time for)
So I agree with Salem, and he is in the right for removing such comments and posts.
Thank you for reading my rant (if you did)