From where I sit, your having vocalized an unpopular but authentic point of view is really positive and constructive. But it’s authentic, not true, and it’s perspective, not fact. I think it’s an important distinction, relevant both to the general theme of truth-telling as well as to the particular truth that you’re trying to tell. Truthfulness is a habit and a skill — telling the truth means saying what it true, but it also means knowing what is true — that is to say, I believe you’ve given an accurate account of your experience in Costa Rica, but I also think you’ve missed a fundamental part of the story.

I lived in Costa Rica for a while, as well, and my experience was very different than yours, in some ways, and not so in others. My journey there was very different. I started out as a volunteer and made friends with a group of locals close in age to me. I remained living and traveling with them for a while, until I found a position teaching at UCR. There was definitely some animosity and/or opportunism in attitudes towards tourists, especially North American and European tourists, but I don’t think it was unwarranted.
Are you from a tourist town? I am. I think a complicated local-tourist relationship is pretty typical, and it doesn’t take a huge leap to imagine that tourists coming from places with significantly more wealth & influence than the host country might aggravate this dynamic. That’s what I remember people complaining about — the lack of respect toward Ticos and Tico culture shown American & European tourists and expats. In my opinion, the complaints were far from unreasonable.

Also, not for nothing, I had a Cost Rican bank account after about six months. My siblings had been there about a week when they opened theirs.

The bottom line: try a different angle. Faces are generally more pleasant than buttholes and most people have both.