Here’s the thing that bugs me about Tumblr fandoms.
People latch onto certain headcanons. These headcanons become popular. Suddenly the fandom starts insisting that said headcanon is actual canom. They become so militant about it that they punish anyone who disagrees with them.
Now, I absolutely love headcanons. By all means, you should rewrite canon. Reinterpret canon. Make the canon more inclusive and more diverse. Question the messages put forth by the canon. You have the freedom to change and critique the canon as you see fit.
But please remember that other people are allowed to have their own interpretations as well. Give everyone the liberty to develop headcanons that appeal to them. And for the love of God, don’t attack people that see things differently than you.