I have to agree with Buzzfl, what does this 10 year old story have to do with CR or ticas, other than it happened to happen in Jaco that time around (or perhaps it was prompted by the recent spate of gringa bashing)? Methinks you've been PUI (posting under the influence) again. Three strikes and we might have to suspend your CRT membership license.
But as long as you're going off topic, I suppose I can too. There are songs like that in every genre (and its audiences). My brother plays banjo (and a half a dozen other instruments) in a Bluegrass band and he grinds his teeth every time someone else in the audience requests "Dueling Banjos", "Orange Blossom Special", or "Foggy Mountain Breakdown" (whenever I go see him play I sometimes shout one of those out with a smirk on my face just to irritate him

). The vast masses, who generally are NOT very sophisticated (or at least not as sophisticated as all of us

), normally like to stick to just the things they know best and are most familiar and comfortable with (sort of like mongers ONLY going back to CR over and over and over again rather than attempting more "daring" monger destinations). Unfortunately, that means having to listen to requests for Mustang Sally, Dueling Banjos or the "greatest jazz" hits of Kenny G, Chuck Mangione or Michael Bolton. And, bringing it all back to Costa Rica Ticas, don't you think if you got a bunch of young chica bargirls together in front of a band or DJ that some of them would probably shout out requests for the most recent top 10 hit of the latest telenovela hunk turned pop star (or actually, lately more likely, gangsta turned reggaeton star)? This is not really even just a "stupid gringa" phenomenon.
Besides, don't be so snooty. What is really so bad about a band being asked to play a hackneyed old hit here and there mixed into a 20 song set, UNLESS PERHAPS you're one of the band members who are forced to play it night after night, or are one of the "afficionados" in the back of the room? The band is there to entertain the CROWD, not themselves and not the handful of purists who might be there. If playing a song or two that EVERYONE can participate in or sing along to is what it takes to help get that crowd energized, then isn't that part of the live music experience?