I have to say, the most annoying thing about Dexter so far is the computers. Specifically the way they beep and bloop as through they're from the early 80's. Why, exactly is this a thing? Is it supposed to make the haven't-touched-a-computer-since-1980 demographic feel more comfortable with the show? Do the writers not realise that we've advanced a little further than PC Speaker sound effects in the past thirty years?
Aaahh, this is one of the most annoying things ever, and this is annoying in all television programs, even films.
This is also annoying with video games in popular media, where I swear every video game to these writers is that disastrous port of Pac-Man for the Atari 2600.
This, and all this is starting to become another set of Pet Peeve Tropes of mine.