Anand, this works. Good conduct means Brahmin and bad conduct implies Shudra. However, not all agree on an individual, whether he is good or bad. Different people have different opinions. So deciding who is a brahmin or a who is a shudra is a personal thing and is not absolute. Is this line of thinking ok? or am I missing something?
So it is almost like when we say somebody is a brahmin we think that he is good. However, the word brahmin and shudra now have acquired a whole different meaning in practice, so maybe it is better to drop those words and just use the usual good, enlightened, learned kind of words to describe whom we think of as brahmin, as I don't think the word brahmin means the same anymore, as does shudra.