You can be a negative/realist as long as your perceived value outweighs your "bad" attitude. The problem with this is that people are really bad at placing value on soft skills and all it takes is one clueless manager to sandbag you.
Everything op said above is spot on
But I mean for anyone with team responsibility: staying silent is bad for you, which is okay if you're in for the career. I totally respect that, people should be ambitious if they want to. But this is the recipe to make workplaces toxic and bad for the whole team.