What do you think downvotes are for? It’s just a number, it’s not an insult.
Downvotes are for maintaining the quality of the conversations, not expressing agreement or disagreement. No matter what someone’s opinion is, as long as its incorrectness would not be made evident by reading the sequences, downvotes should only express disapproval of the quality of the argument, not the conclusion. In a case like this, no argument for the opinion that you disapprove of was made. Unless he refused to acknowledge the substance of your disagreement, which was not the case here, no downvote was warranted.
Downvotes are for maintaining the quality of the conversations, not expressing agreement or disagreement. No matter what someone’s opinion is, as long as its incorrectness would not be made evident by reading the sequences, downvotes should only express disapproval of the quality of the argument, not the conclusion. In a case like this, no argument for the opinion that you disapprove of was made. Unless he refused to acknowledge the substance of your disagreement, which was not the case here, no downvote was warranted.