I know I do it even with those around who aren't really strangers - just acquaintances. Then I think I know all I need to know about them to set my opinion. However, if I'm being truthful, my opinions are based on assumptions. Then my interaction with these people is affected by my assumptive opinion. Not alot of love in that habit. Especially when compared to how the Lord chose to interact with me without any assumptions - He already knew everything about me!
That admission to a bad habit generally isn't enough to change it. Unfortunately my bad habits stick with me until God gets tired of waiting for me to improve. This is an example of becoming the victim of my own habit.
Without a doubt there are those in my small community who are making great assumptions about me right now. There are groups who assume this pregnancy was an 'accident' and, therefore, unwanted. There are groups who assume that after years of disappointment, I must have used special medical intervention to become pregnant. There are still others who assume that my Pastor (who is known to stand firm on God's sovereignty of the womb, and has encouraged other couples to seek this out scripturally) has talked my husband and I into this pregnancy - you know, convinced us to be more 'righteous'.
All these groups include both Christians and non. All assuming they know the 'why' of this pregnancy. They do not know me very well. They do not discuss their assumptions with me face-to-face. Just like me and my assumption habit.
Thou hast beset me behind and before, and laid thine hand upon me. Such knowledge is too wonderful for me; it is high, I cannot attain unto it.
Psalm 139: 5&6
No, I shouldn't make my opinions based on my assumptions of someone's outward appearance. I have no idea what is in their heart. Will I be able to change this bad habit? Well, I'm working on it - with God's help!
Search me, O God, and know my heart: try me, and know my thoughts: And see if there be any wicked way in me, and lead me in the way everlasting.
Psalm 139: 23 & 24