But it's not.
Because, I can guarantee, you are also a consumer. I would put money on the fact you do not, in fact, live a spartan and virtuous life, rising at 4am to don your simple, no frills clothing, of which you only own 3 sets (because why would you need multiple options of clothing?) before eating a basic, nutritionally balanced breakfast with no pointless luxuries such as coffee or sugar, ready to walk the 4 miles to your workplace where you diligently complete your tasks before heading home to a dinner of gruel and vegetables, before scrubbing your kitchen with vinegar and baking soda, and then straight to bed.
Because actually, all of us have more than we "need" in life and life would be pretty fucking awful if we didn't sometimes have nice things just because they are nice, because they bring a little smile to your face, because they make life a bit cosier.
You probably buy a lot of crap that other people don't because that's your thing. Some people love fancy face creams or fine whiskeys or designer clothes or trainers or have classic cars which cost them loads of money but make them happy. Some people spend hundreds on LEGO or collect Star Wars dolls or vintage Barbies or vinyl records. I'm not into any of that, but I don't feel the need to mock someone else's joy just because it's not what makes ME happy.
If another Mum enjoys putting a blanket off Vinted, a pair of pajamas and a lipgloss in a basket and watching their child's face light up once a fucking year and you can't just be happy for them or at a minimum myob then yes, you're miserable, and a hypocrite to boot.