By default, Lemmy allows downvotes globally. However, when a server disables downvoting, it is similar to using a feature that is usually reserved for enterprises and very small, non-federated communities.
If a user prefer to not see downvotes, they can disable it by his favourite client settings, but the rest of the community should not miss this functionality for the pleasure of few users.
I disagree with you, but the fact that all your comments are in the negative while constructively contributing to the conversation is very telling. I don’t think you’re right per se, but holy hell you’re not wrong.
The downvotes on this person’s comments are a perfect example of toxic downvotes.