10. You tend to be negative.
Even if it’s unintentional, when you speak in a negative tone, you shoot down other people’s ideas and sulk more than you smile people won’t want to work with you. And if people don’t want to work with you then you better believe they won’t want to promote you either.

11. You have a bad attitude.
You know the saying The customer is always right. Well, maybe they aren’t always right, but they certainly require your respect if you plan to get any business from them ever again. If you have a bad attitude then not only will your clients refuse to work with you, your boss might refuse to work with you too.