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You have to pick and choose where and when you're having these arguments. The plain truth is that (almost) every board leans to one side of an issue and reading the mood of a thread is just as important to getting your point across as actual conversation.
For example, if I went on, say, /news/ and said that we should gas the kikes and race war now, I'd get goofed on just as much as I would if went on /pol/ and tried discussing the intricacies of Judiasm and neo-liberal ideologies. If I were on /a/ and started a thread about how Avatar: The Last Airbender is undeniably the best anime of the past two decades, I wouldn't get a very positive response.
The point is that you can't go to certain boards expecting legitimate dialogue 100% of the time - on the bigger boards, a lot of people are just visiting to goof off and post smug frogs. That doesn't mean you should never go to those boards to discuss something, just that reading the mood is an important skill.