Using flashblock is not at all disrespectful. Sites can still serve text ads (remember those?) and graphics (even animated gifs, if they are so inclined) to you

Using flashblock is not at all disrespectful. Sites can still serve text ads (remember those?) and graphics (even animated gifs, if they are so inclined) to you. If flashblock is a common phenomenon (I don't use it because I shun sites that have abusive flash ads), it's because advertising networks do an extremely poor job at policing the kind of ads that they publish. (To be honest, they do a better job at it than a couple years ago when you could get the flashy-blinky-type that would play sound without being asked to)