Disapproval has its place in deterring bad behavior. It’s not toxic to disagree with a person. If the only two choices are approval and indifference it promotes toxic behavior as there is nothing to suppress the toxic behavior.
Edit: I understand what you are getting at though and one thing I didn’t like is people using the downvote button as a disagree button. I only ever use it to downvote off-topic, spam, or toxic posts/comments; but I’ve been on Reddit and gotten massively downvoted because I’ve expressed an opinion counter to general consensus (hive mind)