I once worked with someone who saw everything through rose colored glasses. Everything was positive which makes everyone feel good. I heard comments like these:
We all tend to feel better when we are surrounded by positive people. Beware of too much positivity - it can be harmful to your career. Force yourself to be realistic regardless of what you are hearing. Don’t allow yourself to be lulled to sleep by too much good news.
Always ask yourself “Does this really make sense?” And if you have any doubts go back to square one and recheck your facts.