I don't think its very clear that they messed up the Trump story, special counsels office called it inaccurate but I don't really see any reason to blindly believe them.
I find it bizarre that you think that being a liberal has anything to do with this.
For Reddit there is a Chrome plug-in that lets you highlight users who frequently post on specifically troll-heavy subreddits such as The_Donald so you can spot this kind of shit easily.