The Taliban eat Ice Cream.
ISIS enjoy eating Ice Cream.
Eating Ice Cream makes you a terrorist.
Fun game we are playing here.
Seriously for people who have as many social events as the JWs do, to declare someones celebration as wrong is pretty silly. Even the biblical reasoning behind it is filmy at best. I don't think really is any evidence that first century Christians did or didn't celebrate birthdays or had any problem with it.