My son goes to school with this kid, and while they aren't friends, he "knows of" him. Remember that there was no "shelter in place" at the time, actual cases were in the single digits, and the common rhetoric on the news was that young people didn't get the virus. Not an excuse, but a reminder of where we were at that time.
The kid was stupid. He said dumb things that kids say when they are with friends and tipsy. Since then he has gotten death threats and all kinds of horrible statements on social media as well as in real life.
While I agree it was dumb, I certainly don't think it rises to the level of having your life threatened. The kid made a mistake. He has apologized and is sincere.
Remember that we've all done dumb things - most of us were lucky enough to not have our worst moments recorded and played for the world.