To be perfectly Blunt;
"It's not a matter of not agreeing with reviews... it the idea that he thinks that by "criticizing" these films, he's some how better than others." Considering he is the one who is being paid money to sit around and watch films, write reviews and be published in a website that reaches hundreds of thousands of people each and every month? Yeah, you know what, he is better than others, many many others, but then there are also people in better positions, more comfortable lifestyle than him, and so they are better than him.
The idea that people cannot be better than other people is a bullshit product of the 80s and 90s school system. Sorry, kids, you are better than some, and there are probably many more better than you.
"Maybe it's because I do have a problem with elitism." Funny considering you portray yourself here with out-most elitism yourself.
"And if I don't like it, why do I even bother commenting? Because if he's got the right to criticize, I do too." Which puts you into the very same position you are bitching about.
Personally, I disagree with a lot of opinions that MovieBob has, but I enjoy the way he presents his opinions, and I enjoy his reasoning for it. Furthermore, the vast majority of people who do love Fast 5 would most likely end up being frat-boys and douche bags. You may be one of those that isn't (though you'd never have a douche bag admit he is one) doesn't mean that in general, there is a stereotype of the type of audience that goes to see movies.
When a production company wants to create a movie they have to choose an audience to gear it to, simply saying oh 18-26 year olds is just not enough, or too general. If you are making a movie centered around street-car racing and racers, or rather that sub-culture (which by the f'in way is full of assholes and douche bags galore) then you are going target that specific audience first, saying that there is a large enough public interest vested in this.
So yeah, when MovieBob, generalizes and stereotypes a particular audiences for the movies, he's absolutely correct in doing so. And instead of defending the douchebaggery as some people do, maybe you should step back and take a hardlook at the sub-culture you are trying to defend and see why people think you are all douchebags.
(For all the many difference of opinion we do have, I agree with your portrayal of the audience base)