How so? Changing one's environment is usually hard work, and a real learning experience. It's an important lesson to realize that some environments are too toxic to stay in them.
Mmmmm..I am not sure. It seems to me that adapting oneself to a given environment would be far more worthy a learning experience (might be harder as well). I think one should try to find faults in themselves, and fix them, before fixing or outright moving to a different environment.
Imagine a rock that is getting polished. If the rock is given the choice of the file, ending up moving from rougher to smoother until it is comfortable, it will never get polished, right?