We don't just project our subconscious feelings onto other people; sometimes we even project onto inanimate objects. If you find yourself getting irritated by things like: elevators, the street lights, your pants, ad infinitum, perhaps that's a good indicator it's time for self-reflection. Perhaps you're angry or upset with something much deeper than the object or person.
Just because someone isn't an asshole all the time, doesn't mean they weren't an asshole at the time.
It's mostly all in your head.
Both positively and negatively are equally possible ways to interpret the same reality.
Your psychological baggage is showing.
Luckily, most people are too self-absorbed to notice or care.