I taught as a college adjunct for many years, and I knew quite a few other teachers, including one-class-per-semester adjuncts and fully tenured professors, who took a zero tolerance position toward defiance. Do it, and you're done. My own policy wasn't that bad, but it was still considered pretty harsh by a lot of students: You can disagree with me all you want, but the first time you raise your voice and start yelling, or that you curse at me, you're dropped from the class without warning. All of my students were advised of this during the introduction on the first day. Students could disagree with me, but they were expected to behave like rational adults while doing so. I probably tossed dozens of students from my classes over the years (though I later allowed most of them back if they came back and apologized).
Nearly every college and university in the country has policies in place allowing instructors to drop students who are disruptive to the classroom environment, and decisions like this rarely get reversed. If someone can't have a disagreement without yelling and cursing, we are under no obligation to accommodate them.
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