I refuse to accept that we must tone down irony/sarcasm because of dumb people, we as humanity have had this problem for a long time, see: Lucian and his trip to the moon. Yet we've never had to do this. People will actively choose to believe any sort of nonesense (will avoid naming stuff but we all know what written nonesense people believe in) regardless if it is written or done in irony/sarcasm or not.