To understand the right of a person to hold a point of view opposite to your own, is realism.
To deny them to hold any point of view opposite to your own, is bigotry.
You may argue with them, you may try to persuade them that they are wrong.
When you descend to the realms of personal insults, and denial of their right to hold such views, you have lost the argument.
All you have proven then is your own lack of balance
Think of the old saying about people who swear. That doing so shows a lack of vocabulary.