A lot of people dismiss SJW as just an online presence from tumblr. But I don't really believe that is the case. Sure the more virulent forms of SJW are found there, but there are plenty in the mainstream and there is a PC culture that a good chunk of the US population has been absorbed into and lot of these elements are even being exported to other countries.
Take for instance former CEO of Mozilla, pressured to resign. Why? Because he once financially supported a campaign to prevent the redefinition of marriage from male+female to person+person. To the SJW crowd gay marriage isn't an issue to be debated or to be voted in or not democratically state by state, no, you HAVE to accept it else you're a bigot who hates homosexuals. No concern is given to whether or not this redefinition has any basis given the original purpose of marriage as a legal institution (reproduction and natural rights of parenting) or whether or not the government should even be involved in marriage to begin with, in which case, neither straight nor gay marriage would be "legal", the concept wouldn't exist. There is after all no legal recognition for friendships either, but nobody argues that therefore you hate people making friends. The idea is absurd.
Or take for example how trans activists are FORCING people to "use the proper pronoun", essentially forcing people to go along with a mental disorder and treat it as perfectly natural and normal. So apparently it shouldn't be allowed (socially inacceptable and career ending if not illegal) to refer to Bruce Jenner as... Bruce Jenner, even though that is his legal name. These people aren't happy to just go along with their lives, they want to FORCE you to go along with it as well and dictate how you perceive reality.
Also, so what if SJW are "only online" (they are not). Often SJW will try to find information about you and harass your boss or your family to get you in trouble. That is no longer limited to online, that is trying to screw people over in real life because they're right-wing or because they're not the "right kind of liberal", i.e. a far left SJW. Recently Anita Sarkeesian and Zoey Quinn went to the UN of all places to essentially ask that governments of the world treat online "trolling" (i.e. criticism they don't like) as if they would treat physical assault. They also lied that only women experience this online.
SJW are also making it difficult for police to enforce the law in high crime areas accusing them of either being systemically violent or systemically racist, even when the officers act in self-defense to take down someone who resists arrest. No responsibility is apparently put on any of these thugs to surrender peacefully.
And finally SJW hinder the discussion of Islamic fundamentalism while demonizing conservative Christians way beyond any legitimate or fair criticism. Apparently that's not "Christianophobic".