OK, so let me read this back to you:

You're not worried about dying, so you want to have full contact with others, despite recommendations not to, which may expose you to the risk of infection.

You might enjoy those life-sustaining moments of human contact, infect another who dies, and then have to live many long guilt-stricken years, knowing that if you had only worn a mask, they would be alive.

Let's say that you go out, live as you always did, and you're fine and they're fine - maybe a few flu symptoms, nothing more, and you take the bus home, infecting every passenger before you even show symptoms, and the elderly mother - or even young child - of one of the passengers falls sick and dies and you never know about it.

You stop by the store on the way home. The person who serves you is black - despite your comorbidities, is at greater risk than you - and you live and they die.

However angry you are, however miserable, you do not have the right to expose them to that risk. That is reckless endangerment.

That is the selfishness to which the article refers.