These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
However, try picturing any of the Bonds (save for perhaps the one that came after this movie, Daniel Craig) at that concert. All of them, especially Connery and Brosnan, would likely have stuck out like a sore thumb even more if they'd been dressed appropriately. Xander's innate look but, more importantly, his manner are vital ability to blend in with this set. The tuxedo is outer trappings, it's as much the fact that he looks absolutely flummoxed by being in a rock concert in a bar that makes the doomed agent stand out. So the parody's not as shallow as it could be (there were people in suits at the party, disheveled though they might have been).
Also, this may be a homage to very realistic British 'Sandbaggers' series that was once called 'a show about people in suits dying in Prague' and it's popular tagline (often used in-universe) was 'It's not James Bond'. Despite all over-the-top actions, infiltration of Anarchy 99 by Xander Cage is much more solid tradecraft than sending a guy looking like 'Romeo agent' (seducer, high-roller) to infiltrate an organization resembling a biker gang.