There are two meanings of "optimist" (same for "pessimist") that are often confused and mixed up. The first meaning is a person who is biased to expect overly positive (negative) outcomes compared to what is suggested by available evidence and history. This is supposed to be a personality trait and irrespective of any concrete question or issue. As such, both biases are stupid. A self-described "proud optimist" in this sense is proud to be knowingly delusional. I'm not sure anyone calls themselves a "proud pessimist", but replacing the word by "sceptic" or "realist" changes nothing if by it one still means being proud of cognitive bias.

The second meaning of optimism (pessimism) is to expect positive (negative) results for a given question or issue compared to other people with access to (roughly) the same evidence. In this case, it's normal that there would be a spread of opinions, these differing opinions need not be biases (while crucial to explore further and eventually reconcile) and the words optimistic/pessimistic describe something meaningful and useful.

I wish people stopped saying "I'm an optimist" and instead listed explicitly the things they're optimistic about (in the second sense). If you're optimistic about everything, you're most likely just biased and could improve your decision making by working towards correcting this bias.