If a pawn drinks beer or eats ambrosia, pawns with a positive cannibalism precept will stack negative opinion towards that pawn. The pawn doing that will also get a negative mood for doing so.
Negative opinion: https://steamuserimages-a.akamaihd.net/ugc/1841409788604247965/E1E5A9B311897AE8C89B968CEBFEA6D36428137E/
Beer mood: https://steamuserimages-a.akamaihd.net/ugc/1841409788604236384/701F92A2BFB134ECCEB67BF7FDD4EDA1631A1F5C/
Ambrosia mood: https://steamuserimages-a.akamaihd.net/ugc/1841409788604236828/547E9B2F0FECE04FF46DF57AD0DD12177D94F0C9/
While technically with nutrition, they probably should not trigger anything meal based. I've already checked the ranchers meat eating precept and that those can take beer/ambrosia without a problem.
Both DLCs, no mods used.
Thanks for the bug report, I've gotten this reproduced on my own end as well in 1.3.3235. I'll get a report into the devs. As these are recreation drugs they shouldn't be tracked as non-cannibal meals, I agree.