Insulting people is never productive in any conversation or debate. I would consider someone saying "those ignorant fuckers" to be the sort of person who is, at least tentatively, hating or looking down upon that group of people.

What if you were having a discussion with a person who was wrong like, 100%, you-know-for-a-fact wrong. You try to correct them. They refuse to listen to you/misconstrue what you are saying, so you tell them they are wrong again, but more forcefully this time. They become petulant and angry because they're not used to blunt talk or being told they're wrong. You stand by your point, albeit with some colorful, somewhat polarizing language, and tell them to feel free to continue the discussion when they actually have valuable viewpoints and facts to back them up.

I will admit this sounds like the sort of stuff I do on occasion, but any person who goes into any debate or conversation with this attitude is being an idiot and an asshole.

Assuming you are right and the other person is wrong, and assuming you are only there to only change the other person's opinion, never leads to a good conversation.

That doesn't mean you can't assume you are right, it just means you have to be able to look at the other person, look at why they are assuming they are right, and try to attack and wear down at those points of view.

A conversation with a conservative about global warming isn't going to go well if you just say "look! science shows that temps are going up!". People typically have a distrust of such information, and feel they are being fooled by a system set up to control them.

You instead have to start a conversation as to why they have those feelings, and address them. Not just sit on a high horse and shout about how right you are. You should expect nothing but to be ignored in such a case.

Anyone who cuts off a conversation because it is going nowhere typically just isn't good enough at talking to bring the conversation into a decent direction. Even the most fanatic people can be persuaded in the tiniest ways by a decent conversation, but it isn't something that comes out across a single debate.

I mean, like, when I slept with that married guy, I didn't mean to hurt his wife, but I did.

when you sleep with the wife of a married guy you indirectly increase that person's risk for diseases, increase the chances for issues between those two people, and indirectly state that you are fine with the actions of people when they sleep with other's wives. Including your own.