That's not acknowledging the facts of everyday life -- not by a longshot. The situation you described, while entirely unfortunate and I do sympathize, is not an everyday occurence by any means. And it is unfortunate that the encounter turned you off to B6 completely.

But I'm pretty sure B6 realizes that it's losing some people this way. And the business decision to forego interline agreements stands. So B6 must have done the math and figured that the attrition rate is acceptable versus the cost (in dollars, effort, etc.) of interlining.

I get that you're the kind of guy who lets a bad experience turn you off to a company. But you have to acknowledge that you're not "acknowledging the facts of everyday life," when, in fact, it's not an everyday occurence.