For people too uncomfortable to watch this rather disturbing video, I'll do a summary:
Taxman is very drunk and paranoid. He rants about how his reputation is ruined by having his political views linked to his name and he believes that inevitably someone will tell his boss about them and get him fired. His rants, throughout the video, are frequently punctuated by him hitting himself repeatedly. He mentions 8chan's /cow/ and the Kiwi Farms by name. He also believes that US federal agencies such as the NSA are after him, along with the Illuminati and a cabal of evil wizards. This is because they don't want the mystic secrets he has been researching to become known. They want him dead or in a padded cell. He threatens suicide if he can't make it to Equestria. He really hates that we've been saying that he seems like a school shooter and says that people have been telling him that since junior high school (I wonder why?). At some point he switches gears to his plan to meet his father in a restaurant Saturday (8/15/2015) and talk to him for the first time in two months. He expresses hatred for his father, who he blames for his "bad blood" and for being working at a US defense contractor (Raytheon) earning "blood money". His father's money being blood money doesn't stop Taxman from wanting it, however, and he expresses further resentment that his father remarried and that his new wife stands to inherit everything. He expresses hate for Jews and Israel and support for Iran, as they are Aryans, and does a Nazi salute.
Well, that's the gist of it, anyway. Anyway this is definitely the worst off I've seen him so far.
Edit: I forgot to mention, early on in the video he stresses that he doesn't want to kill anyone, not even Lurker, and downplays his racist views. This is very much undercut when he does the Nazi salute later on.