This is similar to the challenge for creating a social media platform where people are radically honest with each other that Darko Savic posted some months back
Yet that was more from a platform standpoint. I'm thinking about things I can do as a user not to come off as brash. This challenge is basically the other side of the same coin.
Shubhankar Kulkarni provided some great suggestions in the second paragraph of this post.
Of course, one should always try to think of a way to make the proposed flaw work.
What's especially difficult is when you don't have a way to improve the idea, to solve the flaw, and still see it. I somehow feel I owe it to the platform to indicate it. It legitimizes what we're doing here. It also makes the platform more alive. It's a challenge, not a putdown.