There’s likely no such thing. How you interpret upvotes and downvotes is up to you. But don’t you think that’s a more much more useful measure than “I like this” and “I don’t like this”?

1. Nobody knows who upvoted or downvoted, at least if you don’t get to see the database or server logs. This means nobody would really know if you in particular liked some post or comment or not. IIRC Lemmy doesn’t even show you what your upvotes and downvotes are. This means you wouldn’t remember what you upvoted or downvoted.
2. What we like or dislike has nothing to do with what is good for more people. We can dislike something, but it doesn’t mean that that something isn’t good for ourselves, or everyone else.
3. Votes can sway where a post/comment appears depending on the sorting option.

Given all that info, you should know that votes matter not for yourself, but for others. Want something to be more visible up top in the Top sorted comments? Upvote. Up in Hot? Upvote. Want them down the list? Downvote.

So then the final question is, well how should I decide what do I want to be more visible and what do I want less? That’s really up to you and what you think your relationship with other people and your world is. You want chaos and like watching the world burn and have yourself caught in that too? Upvote crazy takes and downvote the sane voices of reason and care. Want to promote a healthier world where people have useful conversations that help each other in their lives? Upvote those good comments that do so.

Get your mind off the kind of Facebook voting treadmill where it’s your own visible voice and that everything is just about “me, me, and me” and focus on others for once.

Ofc, if you want to be a troll, have at it and do whatever you want. I’ve wasted my words on you, but I’ve at least left some words for other people.