You're wrong. "Uncivil" is a vague term and someone might just be having a bad day or two (or three). No need to react harshly.
Nobody should be editing Wikipedia if they are having such a "bad day" that they are unable to retain their composure and remain polite and friendly. Harsher reactions to incivility would lead to people thinking twice before posting inflammatory comments—surely, a good thing. Some people might not like politeness and friendliness, of course, and might leave the community, but that is also surely a good thing.
—Thomas Larsen