a good tackle, making a nice block, kicking a field goal, or even kicking a nice punt means you did your job on one play but your team is getting shellacked and celebrating while you are on your back looks like you only care about you and not about the beatdown you and your teammates are enduring.
Meanwhile, his other punts were 35, 38 and 49 yards so I guess if he catches one of 4 for something above normal, it is cause for a huge celebration.
Had he done it in a close game in a critical situation or if his team has steamrolled the other guys, go ahead and live it up since your team has dominated. If you are getting beat by 40, might want to not act like you are helping the team win the game. Just my $0.02. Apparently, you think otherwise.
Would you celebrate a game ending half-court shot if your team just lost by 30?