This is just an observation and I was one of these people so I’m not being judgy but… I ventured into town yesterday and I recon every third women was wearing Birkenstock Arizonas and probably 80% of those were wearing the stone colour. There was one point where a hen party walked past and they were nearly all in the exact same pair of stone Arizonas. There was also an actual queue to get into the Birkenstock shop (and I was in it)!!
It was so bad that I decided not to buy a second pair of Arizonas and bought Mayaris instead.