I think it is not that hard to not be a butthead. Just be nice, don't say every single stupid obnoxious thing that pops into your head, smile occasionally, compliment others. These are the four things you must do if you wish for everyone in the world to not hate you. And you can do them. It's not like I'm asking you to climb Everest with a camel on your back.
There are some things that you just shouldn't do. I could list them all buuuttt I don't feel like it. However, many people know these rules to live by, and they still break them. It's like ehmagoshh youre a rebel, congratulations! Not. Stop trying to create a roadblock on my highway to happiness you a-hole.
The End. Hmph.