There’s like 7 billion more people now than when cats were invented.
I don’t know what other comments you’re talking about, but this seems like an application of the toddler rule. I can’t find it, but there was a great tumblr thread about this. You’ll never be able to prevent nay-sayers and people second guessing what you post by covering all those bases in your post or comment.
Some toddler is still going to point out that your comments about the grass being green doesn’t account for bark being brown.
You just gotta pat them on the head and be kind. Eventually they’ll grow up.