We like to discuss things, as human beings, and part of the discussion process usually involves disagreeing with someone's point of view. Even if you agree with them in general, you might feel that they're missing something that you consider important, though maybe they don't see it that way.
There are, of course, many ways to tell someone they're wrong, but simply disagreeing with someone isn't tearing them down or attacking them, but engaging their ideas and pitting them against your own. Many times we'll challenge what someone says, thinking they're wrong, and either they come around to our point of view, or they come around to ours, but in the process both people have learned something.
The crucial element in this is being able to conduct civil discourse with a give and take of ideas. I think there's this fear among some that even listening to a different point of view is threatening, and that's typically the sign of someone unable to fully defend their own opinions.
So, in this case, you're not wrong at all!