Or simply emoji based “reactions” like in most messaging platforms. This user friendly and immediately understandable system invites many ways to express how you feel about a comment. I think the community would eventually develop a sort of nuanced language to capture how we feel about a comment. Like “we all know what 🏴☠️ means.” But perhaps this is too abstract.
Welcome to the internet, where people try their best to find people with the same opinions so they can feel good and get pissed when they can’t.