A lot of good advice already.
Here are a few which are subtitle but ones people quickly judge you by without you even knowing. They are clues you are not paying attention.

• Pick up your feet when you walk.
• Don't chew gum when interacting.
• Wear appropriate clothing when in house. No reverse hats nor sag pants.
• Manners at the table while eating.
• Telling stories about stupid people or name calling
• Bragging, especially as a know it all.
• Describing how you are a victim of X
• Being rude with your phone, Including talking loudly or normally disturbing those around you. But even texting.
• Understand when people see you check your phone at every call, then don't answer when they call, they then know you put them on a low priority.
• Clock watching is rude unless you have announced it first.
• Dominate a conversation about your interest
• Correcting people
• Being oppositional
• Smoke without asking if it is an issue for others
• Act like you are bothered
• Be sarcastic
• Don't look at them directly
• Roll your eyes
• State you 'have to be you' to be comfortable.

People will make a mental note, you are not to be trusted.