1. You thoughtlessly waste other peoples' time.
People who don't notice the small ways they inconvenience others tend to be oblivious when they do it in a major way.
How you treat people when it doesn't really matter--especially when you're a leader--says everything about you. Act like the people around you have more urgent needs than yours and you will never go wrong--and you will definitely be liked.
2. You ignore people outside your "level."
We all do it. When we visit a company, we talk to the people we're supposed to talk to. When we attend a civic event, we talk to the people we're supposed to talk to. We breeze right by the technicians and talk to the guy who booked us to speak, even though the techs are the ones who make us look and sound good onstage.
Here's an easy rule of thumb: Nod whenever you make eye contact. Or smile. Or (gasp!) even say hi. Just act like people exist. We'll automatically like you for it--and remember you as someone who engages even when there's nothing in it for you.
3. You ask for too much.
A guy you don't know asks you for a favor; a big, time-consuming favor. You politely decline. He asks again. You decline again. Then he whips out the Need Card. "But it's really important to me. You have to. I really need [it]."
Maybe you do, in fact, really need [it]. But your needs are your problem. The world doesn't owe you anything. You aren't entitled to advice or mentoring or success. The only thing you're entitled to is what you earn.
People tend to help people who first help themselves. People tend to help people who first help them. And people definitely befriend people who look out for other people first, because we all want more of those people in our lives.
4. You ignore people in genuine need.
At the same time, some people aren't in a position to help themselves. They need a hand: a few dollars, some decent food, a warm coat.
Though I don't necessarily believe in karma, I do believe good things always come back to you, in the form of feeling good about yourself.
And that's reason enough to help people who find themselves on the downside of advantage.
5. You ask a question so you can talk.
Don't shoehorn in your opinions under false pretenses. Only ask a question if you genuinely want to know the answer. And when you do speak again, ask a follow-up question that helps you better understand the other person's point of view.
People like people who are genuinely interested in them--not in themselves.
6. You pull a "Do you know who I am?"
OK, so maybe they don't take it to the Reese Witherspoon level, but many people whip out some form of the "I'm Too Important for This" card.
Say you really are somebody. People always like you better when you don't act like you know you're somebody--or that you think it entitles you to different treatment.
7. You don't dial it back.
An unusual personality is a lot of fun--until it isn't. Yet when the going gets tough or a situation gets stressful, some people just can't stop "expressing their individuality."
Knowing when the situation requires you to stop justifying your words or actions with an unspoken "Hey, that's just me being me" can often be the difference between being likeable and being an ass.
8. You mistake self-deprecation for permission.
You know how it's OK when you make fun of certain things about yourself, but not for other people to make fun of you for those same things? Like receding hairlines. Weight. A struggling business or career. Your spouse and kids.
Sometimes self-deprecation is genuine, but it's often a mask for insecurity. Never assume people who make fun of themselves give you permission to poke the same fun at them.
9. You humblebrag.
Humblebragging is a form of bragging that tries to cover the brag with a veneer of humility so you can brag without appearing to brag. (Key word is "appearing," because it's still easy to tell humblebraggers are quite tickled with themselves.)
Before you brag--humbly or not, business or personal--think about your audience. Or better yet, don't brag. Just be proud of what you've accomplished. Let others brag for you. If you've done cool things, don't worry--they will.
10. You push your opinions.
You know things. Cool things. Great things. Awesome. But only share them in the right settings. If you're a mentor, share away. If you're a coach or a leader, share away. If you're the guy who just started a paleo diet, don't tell us all what to order.
Unless we ask. What's right for you may not be right for others; shoot, it might not even turn out to be right for you. Like most things in life, offering helpful advice is all about picking your spots--just like winning friends and influencing people.