People tend to be extremely direct in commenting about physical characteristics and personal attributes like how one looks, what they are wearing, etc. They’ll tell you you’ve gained weight or ask about the zit on your face. Complete honesty is the story.
People tend to be indirect about meetings, attendance, and promises to complete a task. They will most likely give a time or an affirmative answer if they think that is what you’d like to hear. It is more polite to accept an invitation and not show up than to decline.