Criticism
If you use your fingers to point when you compare things you're really just throwing around criticism. You should never need to point fingers when you're just comparing things. If you're pointing and picking and being mean, that's criticism.
Some criticism is okay, as long as it's constructive and it helps the person get better. But when you start pointing fingers, it's time to step back and try to not be such a jerk.
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If you're having trouble not giving out criticism, just think about how you would react if someone criticized you. You'd feel an embarrassed heat (ひ) rise throughout your body. That heat will cover your whole face.
Before you throw criticism around, imagine that embarrassed heat. You don't want to feel that way, so why would you do it to someone else?