Did this guy work with JWs in an office environment? If he did; then the holidays would have been an issue. There were probably many small tasks involving the holidays that this guy felt they should have helped out with. For example: signing Christmas cards, helping put up holiday decorations, attending office Christmas parties, donating money to a Christmas toy drive; etc, etc.
Many people can't understand why JWs refuse to "help out" with seemingly minor and insignificant holiday related tasks. They don't understand why this is a "compromise" in the JWs faith. They think that JWs are being irrational, and unreasonable. I'll bet this is why he felt the way he did.