I believe that there is a time, a place, and a proper amount of just about everything, including toxicity. People who wish to interact with 4Chan and its culture need to understand what it really is. The anonymity affords unfiltered reaction and you should never expect your posts to be treated with the kind of social norms that non-anonymous and pseudo-anonymous platforms provide. While the default experience is to have your posts largely ignored, if you actually want honest and unvarnished opinions on your idea then 4Chan is the place to solicit it. As long as people go in with the understanding that nothing posted there should ever be taken seriously and that it functions as counter-cultural catharsis, the perceived toxicity becomes a feature, not a bug.