Sorry to hear you're annoyed,
Just remember you're starting out so expect to not do so well for the first couple. Tailoring the interview is a skill in itself and the more interviews you do, the more you learn how to do it. Eventually you know what kind of motivations and catchphrases they're looking for and you can see the interviewers face light up as you wrattle them off. In sales they love it when you talk about how ambitious, competitive and money-motivated you are for example.
Group interviews suck, it's no secret. I've noticed these seem to be conducted by recruiters with massive egos who fancy themselves as failed showmen. The plus side though is you can see what the successful candidates did and emulate it when you have your next interview.
You might want to consider if a sales job is right for you (seeing as you suffer from anxiety) since they're generally looking for ruthless, resilient, social-animals who can get up and do a presentation at a moments notice. I'm grappling with whether to go into sales work myself. On one hand, I like how it's merit-based with potentially limitless earnings but I hate how insincere it all is.