Yes, if I had two people show up for a social media manager job, and Person A was dressed nicely while Person B was wearing torn jeans and a stretched out t-shirt, unless Person B destroys Person A in experience, skill, and so on, I'm going to naturally lean toward Person A because they look like they care.
If you think there's something wrong with that, cool.
That's a completely logical and appropriate response. I had a write up elaborating then I was like 'this is fucking stupid clearly Person A is presenting themselves professionally and cares enough about the interview I shouldn't have to justify this'. Because really I don't see any point in justifying it to the 1% of people who don't understand.
I think to me it boils down to a persons opinion of what is unprofessional or not. Very lightly colored pink hair is not remotely unprofessional imo and it didn't even cross my mind for a second that it might come up as an issue that it was until she told me about it.