I'll be honest, I feel the same as him. Why wish someone a happy birthday when you have no contact with them through out the rest of the year. But I would never say something to someone who decides to make a post when they get the FB prompt.
Because this bugs me, I change my settings on my bday to limit the people who can post on my wall on my bday. If someone really wants to send a greeting through FB, they PM me.
Regarding the bolded, that's the part that kind of gets me about FB and birthdays. People don't know/remember your birthday, they had to be prompted
to recognize it. Might have gone all year without a single like or comment on their page, but since FB makes it almost zero effort to do so, now all these somewhat random people come out of the woodwork.
Also, I do not see it at all as being the same as someone wishing happy birthday in real life as they are going about their day. That's somewhat transient, whereas, when you look at your birthday wall posts there's a motley assortment of friends and near strangers. Perhaps missing some people you care about, but yay! 10 people who you couldn't pick out of a lineup.