Does it really matter how you come across at work if you get your job done? So many of my clients tell me that it doesn't. True, you're hired because of your abilities, often a technical skill or a specific knowledge. But once you get the job, it's no longer just about that skill or knowledge. Now, you're part of a team, assigned to all sorts of projects that may have nothing to do with your expertise.
You may be the world's leading expert on a specific user interface, or an aligner, or 17th century Norwegian artists, but once you get the job, you'll be put on the party planning committee, or the diverse hiring practices task force, or the workplace safety team. All those extras have nothing to do with your expertise, everything to do with your job success (and job security!) and they all require social skills and a good work attitude. Just like Seth Godin says, "Your smile didn't matter....No Longer."