Inspired by this, I wrote this quick function to paste in your browser console, if you’re on PC:

(() => {
    const comments = [...document.querySelectorAll('main > div > .comments > li')];
    const commentsHolder = document.querySelector('main > div > .comments');

    const sorted = comments.sort((a, b) => {
        const upvotesA = Number(a.querySelector('.comment-bottom-btns > button:nth-child(1) > span').innerText);
        const downvotesA = Number(a.querySelector('.comment-bottom-btns > button:nth-child(2) > span').innerText);
        const upvotesB = Number(b.querySelector('.comment-bottom-btns > button:nth-child(1) > span').innerText);
        const downvotesB = Number(b.querySelector('.comment-bottom-btns > button:nth-child(2) > span').innerText);

        const ratioA = upvotesA > downvotesA ? downvotesA / upvotesA : upvotesA / downvotesA;
        const ratioB = upvotesB > downvotesB ? downvotesB / upvotesB : upvotesB / downvotesB;

        const diffA = 1 - ratioA;
        const diffB = 1 - ratioB;

        if (diffA === diffB) {
            return upvotesA + downvotesA >= upvotesB + downvotesB ? -1 : 1;
        }

        return diffA > diffB ? 1 : -1;
    });
    for (const comment of sorted) {
        commentsHolder.appendChild(comment);
    }
})()

It sorts the comments by controversial, but first you need to scroll through all the comments to load them all.

I tried to sort by controversial in this thread and came to this conclusion

Indeed!