That's actually a form of harassment. He's verbally abusing/emotionally abusing or bullying you. Address it to HR not your supervisor. HR will keep it confidential and investigate it. Keep all the texts that you've received, document the time, day, events, and witnesses. Act natural when you go to work like nothing happened. Don't be hard on yourself, you're not being overly sensitive because that sounds like serious business. If you don't want to speak to HR, try applying to different areas within the company.