I'm not a vegan because I eat egg...but as a non-dairy consuming veggie I can give my epxeriances!
When I first became veggie (beginning of August) I found it SUPER hard to not preach to EVERYONE! I felt like I had discovered the perfect way to live, and couldn't figure out why no one else saw it...so I preached and I preached bad... My Mum went balistic and said that she would eat what she wants when she wants and its her house. And point blank refused to watch any video on animal cruelty as she is a strict follower of 'Ignorance is bliss'.
So i have toned down big time :p Now when asked if I am a veggie (people tend to realise after i've eaten with them a few times) I merely nod. THEN if they question it, I explain its for ethical reasons. They then fall into two categories. 1) They get super defensive, mumble that they don't eat meat EVERY day so are KIND of a veggie.. (No..no you are not) then insist I eat meat again because 'who doesn't love a bacon sandwich?'? or 2) Ask somemore questions and seem generally interested.
IF YOU GET A CATERGORY TWO ACT CAREFULLY! You may have a potential veggie/vegan

Just slip in some facts, don't get arsey with them and suggest a few films. (Earthlings..etc) I personally write a blog because I want my friends to have access to my inner thoughts about animal cruelty but they think they are in control (by choosing to read it!). Win win.
The catergory one people are sadly lost. And in my personal opinon won't change unless they are strapped to a chair and forced to see the meat industry for what it really is. Ignore them. Its the only way. And don't get arsey, bite your tongue. Its the activists/vegans/veggies that attack everyone that make it bad for the rest of us..
Sorry..got carried away!