No guarantee's there, but I can say that it works both ways. Xenophobia and these sorts of biases exist and are normal parts of being a human being.
I would say, it's better to accept that these biases exist, so that you can take them into account when reasoning - rather than trying to delude yourself into thinking you are in entire control of all that is going on in your mind (and body).
I mean, what caused you to believe they were sabotaging you based on looks?
I'm sure there are all kinds of odd reasons why somebody might do that, but it seems like an odd one to assume unless there's a reason for it.
I would say, it's better to accept that these biases exist, so that you can take them into account when reasoning - rather than trying to delude yourself into thinking you are in entire control of all that is going on in your mind (and body).