That's actually really common in the job world. It's not just the job itself, but the environment. I've seen people quit quite often when other people leave or get fired.
That's totally different. When the front desk manager at the hotel I used to work at left for another position, half his staff left within 6 months (given, he took some of his staff with him which isn't entirely legal but whatevs) because they were loyal to him and couldn't work there without him. But they left only once they had another job to go to... because bills exist and we can't pay them without a paycheque.
There's a difference between leaving because the workplace culture changed dramatically and up and walking out because the prettiest girl on the floor quit.
And I also wanted to comment on your 'the job market has been great for me, so it must be great for everybody else' spiel. This doesn't reflect a very deep understanding of employment or labour issues. The economy of a city is greatly tied to the nature of whatever industries are most prevalent. For instance - I worked in Niagara Falls from the time I was 17 to 24. There's two industries in Niagara Falls - there's energy, and there's tourism. Niagara Falls consistently has the worst unemployment rates in Ontario because the work is largely seasonal. There's lots of jobs and lots of money from May to August... and then it's a ghost town. Thousands of people are laid off due to no fault of their own and suddenly the job market is extremely competitive again. Each job posting receives 200+ applications. These people aren't lazy - heck, I was one of them once and I consider myself a workaholic.
Similarly, the town I lived in, which was about 20 minutes away had a great economy and very low levels of unemployment... and then what happened? Walmart came in and within two years I would say about 80% of the small, local businesses closed their doors because they couldn't compete. So, now everyone who lost their job competes for jobs at Walmart, which are precarious and low paid in comparison to the jobs they had at small businesses, and the ones who don't fit have to work in Niagara Falls. It's not about being lazy. Sometimes, people are just unfortunate.
Back to Maddy's friend - Honestly, that's the stupidest thing I've heard in a while. And creepy as hell. But I suppose it's better for the establishment they left though - if this job was so meaningless to them that they'd quit because some chick did, they shouldn't be there in the first place.
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But sorry, this is incredibly off-topic so we should probably snap back at it now. Get it... snap... like taking pictures?