Don't think about it as likes or dislikes. Think of it like engagement or not engagement. Engagement drives ad revenue whether or not it's positive. If you comment to say how terrible a video is you're more likely to have spent time on the page and watched or seen an ad somewhere. If you dislike a video it means you're spending a little more time on the page and might see an ad. Plus your negative engagement, even clicking dislike, might lead other people to positively engage and thereby watch an ad.

Your best bet is to leave the page, scroll to the next short as quickly as possible, or leave YouTube entirely. This tells the algorithm that you're not engaging and won't be seeing ads at all. It's most effective to leave a video within the first 30 seconds and interact with as few things in the page as possible.