I believe the reason that people are so bothered by this article is that everywhere you turn everyone is saying spend less, don't buy that, do this, etc.... Now there is HUGE room for improvement in >50% of the population in the US, since every other article says that the average family does not have 1000$ in savings to cover an emergency. It seems that this article and other statements that echo a similar opinion, is that people who do X,Y,Z are plain stupid for doing that. Whether thats avocado toast, buying a nicer car then a Honda Fit, eating out, etc..
I have a goal of reaching FI by 50 ( currently 36 ), my wife and I desire to retire on more then 30K a year and we want to balance our lifestyle currently and in retirement. There are to many posts/blogs/forums where our community (FI) puts our noses up and says " Look at those people, living such a lavish lifestyle, don't they know that if they at ramen every day, biked to work, and got their groceries from the dumpster they could retire earlier!"
Personally, I could care less what anyone else does with their life as long as they are not a harm to society. For every person that is driving a car that is worth >50k and has no real savings there are people who make minimum wage and has a 200$+ IPhone 7. Like the above poster stated, let people spend their money on what they value. It really disheartens me when I read blogs that discuss why they are seeking FI earlier then what standard most societies would accept as the norm, only to belittle the people that live on the other side of the fence ( those that don't seek FI).
If people want to eat fancy toast, great! I am not a big fan of avocado so I will pass.