My friend said to talk less about this issue in the future. Is it disrespectful to take me seriously?

I think your friends are very direct. You are friends, which shows that you just disagree on a certain issue, not disrespecting you, but trying to stop quarreling and avoid unnecessary embarrassment, but this is a frank performance. Don't have this idea, look on the bright side. Although you disagree, you are good friends, and your friendship will last forever!