I used to feel the way you do. If somebody criticized me or didn't like me, i felt horrible about myself. I was sure they must be right about me, and I must not know myself at all.
And then one day it finally clicked for me. Sometimes it is the
OTHER PERSON who is wrong.
I have personally had both friends and family members assume some very incorrect things about me. And these were people who have known me for years. So if somebody we've known a long time can sometimes misunderstand us, how much more for someone who has only met us one time!!
This person only met you once. How likely is it that in meeting you one time, this person now has enough knowledge about you to correctly evaluate who you are as a person? NOT LIKELY!
Don't let this bozo steal your inner peace!