You are self-destructive, Chin-lee. Is it that your mind is that restricted that you truly can't see how your rudeness interferes with your ability to successfully communicate your thoughts and feelings? You are working against yourself and that is sheer foolishness. Use manners and be courteous; be understanding of the points of view of others and not obsessed with your own, and you'll find that you can experience success in having reasonable concourse with other human beings. You needn't make enemies when you have the ability by choice to make friends. Give it a try.
Best regards,
Thelema