I checked the raws and I have no idea how vinegar day ended up showing up, lol.
Part in question:
「昨日まで情報収集で抜けたアンタは知らないでしょうけど」
I'd totally be for a vinegar day though.
Oh, wait, now that I think about it, the kanji for vinegar does have the same right radical, so it was a visual thing?
酢