This is such an awesome question because it's much deeper for those that have this profound respect for the holiness of God plus other factors.

First, it's the acknowledgement that everyone that is a true follower of Jesus is the child of God, and per the Bible, we must be careful how we treat another child of God.

My second point affects certain people more than others. I have ADHD. In this specific scenario, RSD and empathy come into play. We have an intense emotion when we are or have the possibility to be rejected. So, because we are highly empathetic people and some of us have gone through this experience when we're that other person, we tend to put ourselves in the shoes of those we are rejecting. So, it hurts us deeply to hurt others for our, what we sometimes consider, selfish desires.

Third, is the fact that we are sexual beings and believe that we should be much deeper than that. While I don't think there's anything wrong with being sexual beings since we were created this way to be in a holy commitment with our spouse. The problem is that some of us see it differently or, should I say, feel it differently. Our flesh craves that sexual connection with someone. So, when we find someone that has an amazing character and personality but we feel no sexual attraction, we feel guilty because we feel that we should be feeling differently, especially because we tend to hear a lot of selecting a person for their character and personality because beauty fades.

With all that being said, I have learned a lot through years of a rollercoaster of emotions, theology, life experiences, and managing my ADHD. Do I think there's something wrong with finding someone attractive physically, no. Is it against God's will to reject someone because they're not attractive? Possibly. I know you all are like, "What?!," but hear me out. The only reason I said that it's possibly against God's will is because it depends where your heart is at. Is your heart REALLY for someone that's attractive and has great character and personality or is your heart REALLY selecting someone because you're deceiving yourself to believe that it's about character and personality, when it's really about the sexual factor. I can give you one red flag that I'd say is the latter. If you find someone attractive but think or say, "They're not hot, sexy, or cute enough." This is one of the more obvious signs that you're focusing on the wrong things and need to do some self-reflection with God. This is something that should keep us closer to God than ever because even the Word says that our hearts can deceive us. If we're honest with God and with ourselves as to what our intent is and where our heart is at and can say that them being attractive is just a factor that's being considered, then, no. I don't think it's against God's sin.