The hippy free spirit has surely been shot to pieces when 50% of the crowd are all dressed the same, not because it's what they want to wear but because they feel they have to conform to some kind of latest cool dude fashion code.
Sorry to bang on here ... but ...
It's surely more a reflection of the commercialism which draws them to the island in the first place ? Surely the point is they will see the other 50% turned out differently (whereas many who stay at home especially away from London will not) and therefore they may begin to think about different things to wear which are a better expression of who they are as an individual from there ?
Many of these are young people, often insecure, some of whom have never been away from their home towns. There's a long way to go for them to reach an understanding of the "hippie free spirit" in any way ... but the fact they're starting to go to Ibiza is a pretty good early step ? To ridicule young people who haven't been exposed to a more cosmopolitan environment much or had the privilege of seeing other ways to go, and as a result follow what they are fed by a powerful commercial and peer-driven trend, just doesn't seem right to me, sorry.
Far prefer to look beyond what they are wearing and check out how they behave in a club or on the dancefloor. Amongst those dressed in 'uniform', you can instantly spot the ones who feel the music and really live the dance. Those are likely people who will still be clubbing in 20 years' time wondering why all the youth are wearing teflon cybersuits and pasta-strainers on their heads, as dictated by Zorbmag's Ibiza Fashion, 2032.
It says nothing meaningful about a person whether at a point in time they follow a fashion trend. Every person's life journey has to start somewhere and it's just another thing for people to work through in their own ways in their own time. As an older person, surely it isn't that hard to take a step back and see that .. and to accept where people are at a particular point in time as being simply a snapshot of one aspect of their life development ?