I know I must be annoying, but surely that doesn't mean I'm a bad developer.
You might be an egomaniac, or you might not. It's impossible to tell from one comment, because you've only mentioned a subset of the behaviours, and egomaniacs don't always have the self-awareness to judge their own behaviour.
If you listen and engage with your peers about programming, and not just dismiss everyone else's opinion outright, then you're probably not an egomaniac.
Not only that, you can learn something from other people as you don't know everything all the time. Constantly learning is required to be a good developer. You can't learn when you interrupt.
I worked with an interrupter, he was one of the most incompetent programmers I've ever seen but wasn't capable of understanding his own incompetence because he was too busy interrupting others.
In contrast; I listen to people intently, and love learning new ideas and opinions. However, most people take sooo long to get to the point that I often know how their sentences will end before they do. So I interrupt them.
Some people get offended, and insist on finishing their sentences. In about 99% of the cases, I correctly predicted their point.