I disagree that the comparisons are embarrassing. I think Bird was better, but Dirk is good enough that it warrants discussion without sneering. By my estimation Dirk is probably the 3rd or 4th best player of his generation (those drafted in the mid-late 90s), and he's on the short list of MVP/champions in league history. It's not embarrassing to compare him to anyone that's played.
Comparing the (arguably) 3rd or 4th best player that entered the league in a 6-7 year period with someone who's always in the conversation for best player ever is a fairly bad comparison.
If he's in the conversation as best in a given era, its only natural that he be compared to the best of all time.
Though I don't think Dirk is compared to Bird if they both aren't tall white guys.
If Dirk was actually in the conversation for best player of his era, I think you'd be right. However, Dirk is clearly behind Shaq, Duncan, KG, and Kobe, depending upon how you define the era. He's got no business being compared to all-time greats, unless you're talking specifically about all-time great shooting big men.