First of all, why create a thread in order to wish him a happy birthday when you are already (by your own admission) his chat buddy? The common sense approach would have been to express your sentiments in your chat to him and kept your cake photo private. There was absolutely no need to make a big deal about it by creating this thread.
Second, did you ever consider he might not have actually wanted a thread on the matter created?
Third, sharing screenshots of private chats (without prior approval of the other party) is usually frowned upon.

For everyone, it was indeed Hhampuz's actual birthday and the same as his Bitcointalk account.
Already confirmed before making the post, and he seems to be busy at the moment, enjoying his summer vacation season.
Today, July 23rd, is @Hhampuz's birthday, an excellent senior manager and also my chat buddy from Bitcointalk.