Last year I thought Threads was an existential risk to X. When Meta puts its full weight behind something -- by injecting the app into Instagram, it’s DEFCON 5: You have to squeeze out every last drop of growth from all available surfaces to save the app. However, I started to realize that the opposite was happening: It was strengthening X. If you look at any announcement by Zuck, you will see the most rude & toxic comments on the internet. But when he makes those same announcements on…