I know I'm pessimistic, you don't need to remind me. It sucks that a lot of people are looked down on simply because of how they think. I think that shouldn't be a concern for you though. Besides, that person may even have a reason as to why they have a negative mindset. So don't just make assumptions, ask how they're feeling and listen. And if you're a positive thinker, good for you. Just don't shame others for not being one.