I am sorry you had to go through this. You know, you were happy living your life before this person messed up views of yourself. It is their opinion. Personally I have had people in my life who were witness to my manic states of bipolar who I don't have to see or hear anymore. You don't have to believe this insecure person or their beliefs. You love your artwork and you're a bit eccentric like you said. Enjoy it. Live it. Breathe it. Express who you are. All the greatest artists of our time were all a bit "off". Just proves your greatness even more