>It is just one person's opinion. You don't have to try to slam it down as 'petty'.

Why? if it is petty, why not slam it? it is a single opinion - do we need at least N people to share it before we can slam it?

>They didn't say they reject candidates based on this, simply that it doesn't make a 'good impression'. Weather you agree or not, it shouldn't be hard to understand why someone would think that.

Unless you make 'Good Impression' on recruiter you aren't gonna pass forward in the process, so it is indeed equivalent with rejection.