The key to the text you quote is the phrase "a poor man in filthy clothes." Like I said in at least one previous post, if the person can't afford, better, that is fine. But, in a church situation, where you know each other, and you KNOW the other person is NOT poor and they insist on dressing like a slob in G-d's house, it shows a lack of respect to the Holy Spirt, who is grieved by our disrespect; to the Messiah who gave His life for them and to His Father who is above all things.
In your opinion, is someone who is attending their church dressed in casual clothes, or jeans (for example) a "slob"?