We don't have an HOA here, but we do have "Neighborhood Bylaws," which my realtor explained at the time meant, "We'd like you to do these things, but we have no power whatsoever to make you do these things." - even that didn't mention Christmas lights, just things like "You can't build another house on your property," and "You can't raise pigs/goats/chickens," and "Your outbuildings have to be the same color as your house."
In the 17 years I've lived there, I've seen those three (and most of the others) violated...all by one neighbor!
That was my experience as HOA President. It was one or two homeowners who racked up all the violations. They would pitch a fit, and scream about their property rights and "this is communism," and I'd have to remind them that they signed a legal document when they closed on their home.
CD