It’s a social media site. If you “disagree” solely by hitting a “i don’t like this” button then you’re part of the problem. Use your words. Real cowardice is downvoting things you disagree with, without having to make the case for why or do any kind of critical thinking about your own position.

For example: I disagree with you, but I have expressed it through the above argument rather than with a petty, silent downvote.