Referring to people who aren't knowledgeable about a subject as 'tech-handicap' rules you out as a potential evangelist in my opinion. You need to be an expert, you need to be passionate about a product, but most of all you need to be a nice person who doesn't look down on people who know less than you.
But I do agree about the 'tech-handicap'. If / when you do become an evangelist, these people are likely to be your customers.
If you can't relate to them (why are the handicapped?) you have bigger problems.
Who are the great evangelist you admire? What are they doing well?
Have a look below at WestCoastJustin[1] suggestions. He is bang on!
Have a look at his profile. He is super approachable.
That is a key difference - Evangelist go out of their way to be helpful. They often give you multiple ways of connecting with them. Compare that to your profile - what could you change / improve?
A good product evangelist is someone who can talk about the people they've met in the same way regardless of whether or not those people are still in the room. That is the skill that makes you good at evangelising something - if people like you they'll listen to you. If people see you being nasty they won't, because they'll wonder if you're going to be nasty about them once they leave.
If we're gonna hold words against people, well obama isn't president material, because you remember that one time he said the N-word. No president should use racial slurs. You see what I'm getting at.