It means your experience will vary considerably depending where you are. I'm in Korat and find the vast majority of Thais honest and genuine. Obviously if you're somewhere full of expats and tourists then it's going to to be a different matter.
Very sorry what happened to you, but you kinda put yourself in this position... I don't think Thailand is responsible or worse than anywhere else when it comes to this sort of thing.
Given your specific requirements, Thailand isn't for you. "high level of spoken English" limits you to all the places you don't like. Otherwise I could suggest several places. Don't be so lazy and learn some basic Thai.