That really irks me more than the music topic. I can't stand some holier than thou type judging others by the way that they look.
At our previous church, the audio guy and his wife (our best friends) would always wear jeans and t-shirts to Church. One of the other couples made the mistake of complaining to me about how they dressed (probably figured it was 'safe' because we dress up). The next sunday I showed up in jeans and a t-shirt.