"Agenda" has become code for "ideas I don't agree with", used by people who mistakenly believe it (politics) can be compartmentalized from other everyday topics and only trotted out at election time.
For some people perhaps. For me personally, I find some sites purposefully interject their 'agenda', either left or right into their journalism to the detriment of the piece. You're not going to a get a truely subjective view on things anywhere but some places are skewed to the point that you can't tell if vital information is being witheld or under reported.
I disagree. Agendas are real things. Just because they have one, doesn't mean it is inherently bad or even a disagreeable position... but some people just don't like to be "sold to", regardless of the topic.