Perhaps those whom get those kinds of comments and it bothers them, could send a private message to people whom make such generic comments and say something to this effect:

"Thanks for commenting, but I was really disappointed when I saw you make the same comment on 20+ other images today. I ended up feeling worse then if there was no comment at all."

Hi, my namez: "NO, Bad Kitteh, NO!"  Whaz yurs?
BadKittehCo Store  BadKittehCo Freebies and product support