It's not frightening or evil, just somewhat disturbing, in a kind of emotional sense.
First point - the only dream interpretation that matters is your own. You will choose whether someone else's interpretation is accurate - only if you think that yourself anyway.
Second point - could you reasonably expect to have no emotionally disturbing content in your psyche ?
Third point - Sleep researchers have found that you have about 6 or 7 dreams per night, and that the last dream seems to be like a 'punch line' to the preceeding dreams. This was found by using REM detection to establish when dreams began and ended, and waking the dreamer at the end of each dream ( using a buzzer ). The dreamer then spoke whatever they could remember of the dream which had just ended, into a recorder, and went back to sleep. The final dream usually involves some kind of pun or similar device which links the preceeding dreams into a meaningful whole.
So analysis of an isolated dream fragment is probably not going to give you much insight.
Tibetan teachers also point out that the first hour or two of sleep produces 'garbage', often with stressful content.
My advice is let it go .
I am occasionally psychically perceptive though, so if you want to PM me I'll put on my mystic hat just for you...