It's hard to answer this as an outsider because it's hard to know what exactly your manager(s) consider toxic. It's cultural. At my company we have very open and frank discussions of what our systemic problems are or what our team problems are, etc. But I've had prior employers where those same discussions would have been considered out of bounds and inappropriate.

As general advice though, I think if you like your job and want to stay there and be in good standing with those around you it's extremely important to learn the culture of that workplace and adapt to it. If you're getting feedback that you are being toxic, and it's not just from one person who doesn't like what you're saying but really is a clash between you and the culture, then you need to listen to that feedback and reign your personality in.

You can vent to friends and family outside of work. And if you really don't like it, you can always find another job that is a better fit for you.