Surprisingly, it wasn't even them that told the media, it was the charity Red Eye (to whom they donated the food).
"The Instagram post by Red Eye founder Justin Mayo explained, "Got a Christmas call from Jenner / Kardashian Home saying they wanted to donate some food." Then, 100 chef-prepared meals were donated to the homeless. "No publicity. No press release," the post went on to say. "Simply an amazing family loving their city."
Justin ended the post by writing, "They had no clue I'd post this but I felt people should see this side of their hearts. Thank you."
Can't really find it in myself to criticise a charitable act either, as others have said I doubt the people who received the food would be complaining, and that is all that matters.