As "open-mindedness" is commonly used, it's a conflation of three different concepts: inquisitive-mindedness, genuine open-mindedness, and tolerance. Inquisitive-mindedness sounds like what you're advocating - it's willingness to consider an idea and accept or reject it, and having rejected it to be less likely to consider again. Genuine open-mindedness is vaguely accepting without critical examination. Tolerance isn't epistemological, it's ethical and political - there's no necessary connection between willingness to accept ideas and letting people do what they want in their personal lives.