If someone is riding my ass and I brake check them and they rear end me, am I at fault?

I was doing 85 in a 75 and some asshat was riding my ass (tail gaiting) me until I got fed up and brake checked him and he swerved to avoid hitting me. Had he hit me, who would have been at fault? What do you usually do in this situation?
If someone is riding my ass and I brake check them and they rear end me, am I at fault?
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