And this is the problem, all of these responses like "well if I were the interviewer..."
Unfortunately it doesn't matter. Either you can look nice and presentable for an interview or you can not. That's YOUR choice. The interviewer, however, is either making a decision to spend his/her own money on you or has hired someone in HR to make that decision. And if you want a job, you DAMN well better try to fit whatever is going to give you the best opportunity for landing that job.
The reality is that there are jobs for everyone, and for every way of dressing and etc etc. The reality ALSO is that for many jobs (typically the better paying ones but not always), the more professional of a look you're going to need.
If you guys want to sit and argue on the internet about what you should or shouldn't have to look like because you don't feel like dressing that way, then fine, just understand that's also directly affecting your prospects.
Once you start looking for a job, or get a job - you're on someone else's clock, payroll, and set of rules. You'd better join THEIR standard or keep looking elsewhere.