"You can draw a lot of conclusions about somebody based on what they wear in certain circumstances. A person who wears a baseball cap while eating indoors or wears a t-shirt to a good restaurant is probably someone who wasn't raised right and isn't really worth knowing."
Yes, there are some people who draw conclusions based on other's appearances. The fact that you would judge someone based on nothing other than what they were wearing in a certain situation is, IMO, very un-Christian-like. One thing my momma taught me as a little girl was to not "judge a book by it's cover". Other similar lessons were learned in Sunday School. I'm 49 years old now and I remember the lessons, and try very hard to live by them.
Then how do you explain this text?!
1 Cor. 5:12: For what have I to do with judging outsiders? Do you not judge those who are within the church?
I agree that we should not "judge" people who are wearing baseball caps in restaurants, etc. However, when it comes to the things of G-d, we are call upon, even commanded to exercise G-dly discernment.
1 Cor. 6:2-3: Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent to constitute the smallest law courts? 3 Do you not know that we will judge angels? How much more matters of this life?