If you are sick at all, stay home.
It's not just #COVID. If you have the #flu, stay home. If you have a #CommonCold, stay home.
It's a #morality statement. If you are sick, do not transmit that illness to the community. If you are sick, you will recover faster if you stay home and rest. Staying home is a win-win-win.
Of course, from that #morality statement, we need to create social structures that allow you to stay home when sick. (Sick leave is a win-win, better for both the individual and the community.)