To show my crinkly old age,
Common courtesy requires that you should vote, even if your vote is microscopic, when you like/approve of someone's post/comment
If you don't like the post/comment, turn your back [do not vote] on the person/bot and, as in real life, they will get the hint and either stop or go away.
similar to training a dog, reward what you want to see it do, ignore/turn your back on bad behaviour. [I don't know if this will work on brainless "bots" though, although they have masters who control them so it may be a two-step process]