Boyfriends parents coming between job

So I have never really agreed with his parents on anything. They just come off as selfish people and never seem to put anyone else first including their son. So my boyfriend graduated in April. He went to a career fair with tons of people who are in the field he wants to go into. There was one area that he LOVED and applied to the job right after. Well he just go informed that he is invited to sit for the selection test and if he passes to interview after. Which is great since this job really interests him. A few of his friends with similar qualifications applied and haven’t heard anything back yet. Well the date of the test/interview is when his parents planned a 3 week cruise vacation all over europe which he said he didn’t want to go on before they booked since he was applying for jobs. He’s told them about having this interview and they legit said “well it’s not meant to be then”. There’s no way for him reschedule the test he would just have to wait to be invited again which could take months. I have confident he can pass the test but if he doesn’t he has to wait a year which isn’t horrible but at least knowing that would help him apply for other stuff while he waits to retake it.

. He’s all stressed and upset since his parents are making him feel bad for getting an interview when all they have been doing is telling him to get a job. He feels bad that his parents would lose the money he paid for but at the same tim I told him the other option is he gets the job and is making $60,000 a year which in comparison to the vacation trip is nothing. In addition his parents are very wealthy and can easily take the loss of this. I’m just so pissed at his parents since this is something he really wanted to do. I know he’s going to miss out on the test since his parents control his life. I am trying to stay out of it but like there will always be other vacations but he has the opportunity to get his dream job now. Also in the past year he already went with his family to Mexico, Puerto rico and Florida plus has lived with them the past 3 months so it’s not like he needed this trip to spend time with his family. Plus if he gets this job he has to go to a training academy when he and I planned a vacation (our first vacation after dating for 4 years) in August. And like yes I would be upset but would be happy that he has such a great opportunity. I just can’t get over that his parents told him it’s not meant to be when clearly it’s meant to be since he got invited for an interview....how can I stay out of it but make him realize he needs to do what is best for him.