Last year, there was a person in the lobby who said they wanted to kill themselves. I tried my best to intervene and we talked in PM for a while, and I added them to my friends list and tried to check in after a while. I saw them once after that and they thanked me for talking to them instead of ignoring them. They said they were doing a lot better now.
Just because some people joke about it doesn't mean everyone is, and if we filter out those kinds of messages, we could potentially be ignoring real people who are considering taking their own life and they might want to go to someone here on the server instead of a phone number that appears in chat.
Case closed?