It's a marker of the class divide.
Someone upthread said 'oh so you don't have much money but can afford a holiday, but not clothes from sustainable brand' when talking about buying new wardrobes for holidays from fast fashion places.
If you're working class and you have limited money, for most, saving up for a holiday is the number one priority. It's a treat for everyone, it's exciting, it's an escape, it doesn't happen very often - it's a huge thing to look forward to.
No that doesn't mean they can afford to pay more for their clothes. It means they're putting all their spare money into a good holiday experience for their family and want to buy new holiday clothes to feel good while they're away. A lot of working class people's mentality is that they don't have much, they go all out on that one thing they've saved for. All the money is going on the holiday, no they don't have the money to also go and buy sustainable clothes from more expensive places.
They aren't thinking about the impact on the environment, because after all, that stuff generally costs more, and they don't have much - they feel hard done by. Often their work is manual and extremely hard and not well paid.
The middle classes preaching about sustainable clothes and not buying from places like Primark, buying bees wax lids as opposed to cling film, getting electric cars to help save the environment is obviously going to rub them up the wrong way!
Especially when many of the middle class people saying it have much larger homes, go on more holidays, bigger cars etc. The working classes are just going to think 'Where on earth do they get off trying to tell me what to do with my hard earned money when they have all that!'
I've made a lot of generalisations on this post and there are obviously exceptions to every 'rule' I've set out here. I'm just trying to give a general picture. And I'm not saying that any of this is right it's just how it is.
I grew up in a working class family and as an adult have a more 'middle class' lifestyle. So I feel like I lived both perspectives.