In the case above, that's because it was invited. Saying "I cut this thing out of my life" is one thing, it's another to say "I cut this thing out of my life,

In the case above, that's because it was invited. Saying "I cut this thing out of my life" is one thing, it's another to say "I cut this thing out of my life, and so should you". The former is a statement about one's own preferences; the latter introduces a conversation about how much of the thing should be in the lives of the people in the discussion. That's two people expressing opinions about how often the other ought have that thing in their life. The person who initiated that should know that.