Peer review bias story

I wrote an article about how bad is tattoo really is and gave is\t to my classmate to analyze for bias.

They told me that I am wrong in many several ways:  

1.Bias by story selection : I describe about people who have tattoos that they think they are going to be unique if they got one and I also mention that some place or some artist they don't use a high quality ink, and use an old needle.

2. Bias by spin : I said that tattoo makes people look like a criminal and maybe they are a criminal, but in fact they just love to decorate their body and somebody get a tattoo because they love it. Several people decide to get a tattoo because they love it. They just want to deference from others.