>I didn't know these terms were used outside tumblr.
They definitely are. I wish I had your life instead of mine, where I didn't have to deal with people who unironically say shit like that on a regular basis. I live in an ultra-liberal area. SJWs really do exist. Maybe not where you live. But you presumably living in some tiny town with only rednecks doesn't invalidate my experiences of having to deal with SJWs who say shit like that.