Due to having put my foot in the "ignorant of the story but have an opinion anyway" pot a time or two, I will usually keep my comments to 'witty quips" if I don't really want to read the story. If I want to express what someone should have done or make more salient comments, I try to ensure the facts won't negate my point of view.
If I screw it up - it's no big thing to say, "oops".
Now you can be humbled by my sagacity too......
I yield to your sagacity. I have plumbed the depths of my soul to ensure my idiocy would forever be expunged. I am now alone in my despair.