I'd be afraid that the food had been tampered with. It isn't even something that I'd considered until I saw this post, but there is actually a huge degree of implicit trust involved in eating a meal prepared and handled by someone else.

This meal was targeted specifically because it was labelled kosher, because it was expected that a jew would be receiving it.

The message itself isn't anti-semitic, but the targeting is, and there are many actual anti-semites out there who want to cause real bodily harm and/or death to jews.

How do you think a muslim or palestinian would react if their halal meal had been tagged with the note "never forget october 7" or something similar?