Oh I know many people try to make make light of such things just as a coping mechanism. I've also witnessed this sort of thing in my old line of work and have been guilty of such behaviour myself.

Also, I've usually felt even more guilty afterwards when I've thought or behaved along such lines. I remember back in February not taking the looming Coronavirus epidemic too seriously but now over 35,000 people in The UK have died. A lot more actually, if you include care home and other figures. So, there's nothing funny about such things at all.

If it's only yourself who is suffering, then I daresay it's OK to joke about it but not on behalf of or at the expense of others.