samuraigaiden: First of all SJWs isn't even a real thing. People have different opinions on all subject matters and diversity of opinion is a fundamental part of a healthy society. When someone uses a word like SJWs to label anyone who either disagrees with them or is remotely associated with a ideas they don't like, what that person is doing is trying to stop any form of debate. The result is - and we see this all the time on social media - people only preaching to the choir and any form of dissent turning into a barrage of insults.
It is just a "label" and in that it's not really any different (or less real) than any other labels whenever they were made up recently or centuries ago, saying it's not a real thing is like saying that "geek" isn't even a real thing because peoples have different opinion when it comes to hobbies and don't all react the same way.
IMHO the real problem is not whenever "SJW" is a real thing or not but more that, as you said, nowadays peoples are no longer able to discuss anything without resorting at throwing insults and labels at each others as soon as they are disagreeing. Whenever those labels are "SJW", "NPC", etc... on one side or "gater", "manbabies", "mysoginerd", or whatever "...phobes / ...ist", etc... on the other side doesn't really change a thing.
Sadly it doesn't look like it getting better anything soon with the crazy ultra polarized outrage culture we are living in nowadays.