Hmm... I definitely don't think it's an issue of who has it worse than anyone else. I grew up hiding everything; there was no other way. I am an expert in lying about my flashbacks, a body that literally freezes up in fear, disassociation, depression, and sometimes debilitating anxiety.
To me, playing that game just holds people back, as when you put yourself on a sliding scale like that, if you're not careful you give yourself reasons to not get better, because you're "worse off." But everyone's different, so maybe that's just me.
As for saying one should do nice things for themselves... If we can't find joy in the tiniest of things, we will never find it in the biggest things; therefore, we have to start somewhere. There have been times in my past where that ritual literally saved me, as I forced myself to find joy despite my brain wanting to find negativity and horror and fear in the rest of the world. It has kept me from spiraling fast and hard and is easy to do and I stand by it firmly as a path to self care and improvement.
Edited to add: When I was first dealing with my diagnosis, words like the ones in the original post were definitely a phase I went through. However, I think it's a phase, which is important to remember, because that means it will (one day) end if you see it as a phase and not for eternity. For me, each new phase meant I was getting better, no matter how hard they were (and I had a setback this summer that kept me lying on the couch eating peanut butter from the jar with a spoon staring into space). Making the major mental shift that having PTSD is about various phases vs. being stuck in one gear (which I was before therapy for 30+ years) really helped me, especially during the times I wanted to end it all. It didn't make it all easier, but the perspective helped me grab onto the mast and hold tight knowing if I worked through it, there were better days ahead.)