I sympathise with your feelings but I have no such feelings. I think some of the odds in my favour are that I don't live in Bangkok, Phuket or Pattaya!
Cost of living has increased but not out of my range; as you say, inflation is in all countries.
The number of times I am subjected to dual pricing is not enough for me to see at as a general problem!
The "Thai Smile" exists for me wherever I go!! Yesterday, in a large local store, I was in a queue at the cash desk where the customer in front of me was messing about on her phone. The Cashier was getting frustrated. When the Customer left, she cashed up my stuff and attempted to tell me in English the cost. I know I had bought about B600 worth but I said as a question, "Neung ruy ha sip baht". The smile I got was beautiful! I don't claim it made her day, but It helped in a moment of her irritation! I perform this silly act often at the till. It really is a boring job they have!
Is the grass greener in Vietnam? Or anywhere else for that matter!