Ok, first off, the clip of Felix in a nazi outfit looking at a Hitler record was taken straight from a video of his called "I'm racist?!" where he mocks the fact that so many people take his jokes out of context as direct controversial statements. Well, good job exactly proving his point and taking the hilariously obvious bait, Wall Street Journal, to any sensible person who actually looks up the context of the claims in your articles, you just made complete and utter fools of yourselves.
Plus the "Death to all Jews" banner's full quote read "Death to all jews, love Fiverr", the joke here being that Felix makes it seem like it was Fiverr's statement, not his. I'd still say it was rather distasteful and that he went a bit too far, but once again, context matters and the butt of this joke was Fiverr, not the jews.
Secondly, has any actual jew come out and said that this was genuinely, truly offensive to them, or is this another case of people being offended on the behalf of others? The only one I know of who's made a direct statement on this situation is H3h3, who thought that these "anti-semitic" videos were hilarious and not offensive at all (although I personally think that H3h3's an opportunistic git who leaps onto whatever the current big controversy is, so I'd take his videos with a heavy pinch of salt). Whatever the case, you must acknowledge that everybody reacts differently to taboo-breaking jokes like this, and claiming that Felix's videos are insulting to each and every jew of the world is just straight-up wrong.