Coming to Mastodon means breaking out of the familiar. Many are afraid of it even. Corporate platforms are easy and comfortable. They're familiar and the algorithm means less effort on their part to get what they want out of it.
Thus it's primarily a certain sort of person who chooses to come here against the flow. The sort of people who come here are simply more likely to be minorities/etc targeted by the right. They have less tolerance for the right so are more likely to block.