I see your point Nuffs - its not a good look, especially on TV.
Surely there is some acceptance that as the World record holder, she has the right to be disappointed? And remember, these interviews happen about two minutes after the race finishes. Are you saying she should lie in the interview and pretend she is happy, even when she is not?
And what about footy players when they lose a GF and they sit around sulking on the field, and in some cases shedding tears. Should they too be the happiest people on earth, because they gave their best but were beaten by a better team.?