"They're not the same as reading a book or watching the telly. People get quite 'addicted' to them, and spend hours on them. They also seem to block out what's going on around them in a way that people don't when reading. It just seems so teenage."
It is completely the same as reading a book. "Addiction" to games is nowhere near as common as the media would have you believe, and in most cases what gets called "addiction" is actually more a case of avoidance of other things. Eg. depression. And in those cases it could just as easily be TV or books.
I can think of many many people who spend a huge amount of time watching TV and reading to the point where they can block out what goes on around them. This is not unique to games in any way.
"Yes but come on, aren't we all narrowminded when it comes to what we are and are not sexually attracted to?"
Some more than other evidently Plus, most of us aren't reacting the whether you fancy gamers or not, as someone else said earlier, more for us. What you do find issue with is
"It's so immature."
Which, strangely enough, we can understandably read as
"an attack on EVERYONE who EVER played a computer game"
So coming back later and saying "oh, well I didn't mean that", is a little late to wonder why we found your OP so ridiculous.