We acknowledge the dumb opinion by calling it dumb.
We should acknowledge dumb opinions by explaining
why and actually, y'know, debating them. If you can't have an honest conversation, how do you really know you're right.
And if someone says something dumb on Twitter
in good faith*, the appropriate thing to do is to reply why you disagree not to screenshot it and spread it around social media alongside "hey look at this thing this guy said, isn't he stupid?"
*"in good faith" being the key, here. IE, a troll who harasses Anita because she's the devil is not making a comment in good faith.
Edit: In the past, I've tweeted some stupid opinions. In a couple of cases, strangers even responded and discussed them with me. I eventually realized that I was wrong.
If I saw a topic like this on resetera about one of my stupid tweets, I'd be pretty hurt. And I wouldn't consider it warranted.