Sometimes you just have to accept that some people are shitty humans and stop trying to see the good that isn't there. - It's takes a lot for me to believe someone is a shitty human being, but once I do, I'm done.
Users and Takers are a bummer but a part of life. Lower your expectations and you'll never be disappointed with the negative aspects of human nature. Stay true to your goodness anyway. Good actions manifest into good lives.