[header] How to annoy argumentative people [title] Don't argue. [step] It can seem difficult to avoid being drawn into a debate. When faced with a very argumentative person, it is important to remind yourself that your antagonist does not likely want to hear your opinion. 
Nothing you say will be convincing enough to settle the argument, and an argumentative person will likely not admit it even if they are wrong. Save yourself a headache and just say you're not going to debate the topic.