The danger of "mind reading" is when your assumption about what the other person "really" means isn't based so much on logic but on your own subconscious fears about that person (which may present themselves to you as "logic" and it can be difficult to tell the difference). That kind of thing is kind of like a way of soothing one's own anxiety that never the less ends up inflaming it in the long run…
This is a really good point. Sometimes by reading too much into what others say, we can miss their true intent and that can lead to unnecessary conflict.
I don't know that I've been hyper vigilant, but I've made assumptions about people and their intentions that turned out to be completely wrong in the past. Sometimes I've been on the other end--I've missed cues from others that in retrospect, I should have picked up. I'm working on finding a happy medium, where I take people at their word for the most part, but also listen to my gut instinct when something doesn't seem quite right.