They are in the middle of a game! I haven’t noticed any pockets in their uniforms in which to keep a handkerchief or tissue. Plus the fact that it takes time to get it out, blow and dispose of it. And how would they dispose of it?
It isn’t pleasant to see the process. Perhaps we should not have the games televised so you get every gory detail really up close. Or the photographer and TV producer should censor those shots.They probably do it on purpose.
Shut your eyes for those few seconds if you can.