I can't stand fanboys at all. Apple ones seem quite bad, the big Apple fanboy attitude is that the only device that should exist is an iPhone, and all other developers and manufacturers should make content for Apple. All hail Apple. etc.
Years ago I used to get into fights with them but now I just pity those who put way too much effort into loving a product to the point that all others, well as I said above. But that's the difference. That's a fanboy attitude, fans are great.
But I think all that is part of growing up. In that you mellow out and just go with the flow as you get older.
How do I deal with them now? If they're spreading FUD I'll reply once correcting them, and leave them alone.