But how do educate yourself though ?
The same argument was already made about books or newspapers: depending of the subject a lot of them are trash. Same for TV news. Wikipedia is also not a defacto trustable source.
Except for first hand experience on a subject, you will never be able to find a source that is inherently trustable (and you might even interpret your experience the wrong way, so you should doubt yourself too...).
To educate yourself, there's a point where you have to try to trust some of the information you get. Having that info come from a trusted source or with a high level of peer review is a useful first level of filtering. From there you can (and surely should) invest in more time to double check or cross check if you want, but IMO quick filtering is necessary, and can't be brushed away saying "people should know better".