The suite of arguments characterized as 'SJW' is quite wide, and a lot of them do have serious merit - for example, the 'damsel in distress' is overused in computer games.
And Hollywood too. Do you know why? Because the audiences like and respond to tropes, and there's only so many new ideas under the sun.
The problem with the SJW crowd is that they use overwhelmingly poor arguments, ridiculous arguments, and do so in a most obnoxious manner.
Like the person who most famously complained about damsels in distress is in video games is... a damsel in distress in real life. That's her schtick.