I've been here 16 years and never had any of these problems or negative feelings.
If I didn't like it here, I would leave.
Yesterday, weather was fine, went out cycling 20km along rural roads, bought moo ping and sticky rice for breakfast from a roadside stall (30bht), out to a bar with a pal in the evening small Leo (80bht), then Tacos at La Casita (180bht), then live music in the Moat house with a small Leo (100bht), life was good.
Today, weather is fine, a pal is just about to call round and we'll go out and have coffee, maybe walk round the local lake or play table tennis ....... as an old guy, life is amazing nearly everyday in Chiang Mai.
No dual pricing in my life!