Sorry, you're wrong. There is a section that I'll quote;Umm, no it doesn't? See, this is why I have such a tough time with these arguments. Folks are just making stuff up to support their points rather than actually LOOKING at what's there. I mean, THIS is the relevant part of GoS:
That's IT. That's the sum total of reaction. No "utterly alien" or poor treatment is mentioned AT ALL.
Your argument doesn't actually reflect anything that's actually written.
Saltmarsh's roughly five thousand residents are predominantly human, with the dwarven mining contingent of about two hundred workers the largest non-human faction in town. Elves and halflings draw no special notice, since the Silverstand hosts a wood elf enclave and a few halfling villages are tucked in the hills around town. The residents react to other visitors, especially tieflings and dragonborn, with a mixture of curiosity and fear.