Firefox, Mac, and Communication

I have to admit, I love the Mac and PC ads ... most likely because, if a computer matched my personality, I'd be more like the Mac character than the PC one. It's for this same reason that I'm loving this new viral campaign from Mozilla for Firefox.

As the stats run across the bottom of the screen, the lifestyle they are identifying as "boring" doesn't look like my life at all and so, I don't find "boring" to be offensive. However, if I was somebody who embraced the lifestyle they classify as boring, without finding it boring, how would I view this ad?

Now, personally, I don't think Mac is trying to sell computers to people who "are PC" or that Firefox is trying to get people who "are IE" to download their browser, rather, they're going after the much large crowd who use PC and IE because it's all they've been exposed to, however, is it ever wise to insult somebody and then tell them how great your product is?

I'm thinking there's a parallel when it comes to Christians sharing the faith. Is it ever wise to open our sharing of the Gospel by insulting or stereotyping the person we're wanting to share with?

My best friend Dan used to be in sales and his comment has always been something to the effect of, "Whenever I talked about the weakness of the competition, I was just giving them free publicity, but when I only talked about how great my product was, people found what I had to say compelling."

Thoughts?