There have been several high profile cases used as examples, like the guy who was convicted for making a video of his girlfriend’s dog pretending to do a Nazi salute: https://en.m.wikipedia.org/wiki/Mark_Meechan
Doing anything considered “grossly offensive” online can result in the police knocking on your door and financial penalties. It’s a foreign concept if you’re in a country where making jokes online doesn’t constitute a risk to your freedoms and finances (which is more than just the U.S.)