Are you saying you've never changed your mind after ruminating over time about information you've received?
When I first heard of GMOs, especially since my information/propaganda channels inexorably linked GMOs with Monsanto's controversial business practices, I was lead to distrust GMOs. A few years later, I read a few articles about GMOs in popular magazines. It turned out that I had some basic misconceptions that are extremely common. The most important being that traditional breeding is far more fraught with uncertainty. The second misconception is that GMO practitioners are just tinkering around; where in reality genetic modification is narrowly targeted and predictable. The outcome is to increase food safety; fewer pesticides are used, causing less damage to waterways and ecosystems. Less food is wasted, meaning more is available for consumption.
What didn't work was overt ridicule of my ignorant position. Several opportunities to digest non-confrontational information were required.