I saw it, and it was funny there.
What I mean by inappropriate here, is that the scenes goes:
Frustrated Kazuya -> Softdrink stream -> Grannies laughing.
After the first and 2nd scene, my brain thinks "Kazuya popped one off for post-rub-clarity?", only to then realise that the grannies were laughing at the cola.
It's most likely the effect the show was going for, so in that sense it was appropriate for this show.. but inappropriate for the "sad things were just discussed" moment.
If it's not Isuzu-chan Mii~