Sometimes you need to be blunt, and just tell the other person how you feel. You don’t need to always understand your friend’s emotions and motivations thoroughly, and you’re allowed to disagree on things.

I’d tell this Karren:

“a happy birthday message, to me, is that you cared to put effort into something special for me. Even if the result is terrible”

It gets the point across, even if it can be difficult to say. That’s just how life is sometimes.

Putting this out there for the world to agree with you on how you dislike what she did? That doesn’t sound kind, nice or a thing a good friend would do. In fact it’s how some little kids fight in front of their parents.

She’ll probably call you back after what you did here