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I do not think that pouring drinks on the floor is rejecting a toast or ending civilities. I read in a article that: "pouring one out refers to βthe act of pouring liquid (usually an alcoholic beverage) on the ground as a sign of reverence for friends or relatives that have passed away." So this would indicate the meaning behind pouring drinks on the floor.
https://vinepair.com/wine-blog/libations-and-the-ancient-history-of-pouring-one-out/