The gag wasn't the issue, it was the fact that Bloo was going a great length to humiliate Mac........again. The fact that Mac has a physical fear of birthdays because of Bloo's actions is not exactly a healthy thing.
Bloo has literally warped Mac's perception of something and it not only caused Mac to act crazy (which I admit, was funny) but it made him feel sad and then humiliated again at the end.
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