There are people who would call us all wannabe's just for even thinking we are Otherkin in a way that does not agree with them Kiari. I wouldn't worry too much about him and his opinion of you.
Some people think they have the right to judge others and their beliefs, if I were you I would do my best to ignore him.
He will miss out on many things in this lifetime with an attitude like that.
As for calling you a wannabe, just consider what he said to you little kitty.
He said that if he met you he would eat you! There are two names to call this threat.
Since he does not believe you are truly kin, either he as a human is threatening to eat you as another human and if that is the case it is cannibalism which is against the law.
Or he believes he is actually a Dragon who would eat you as a human, which is called insanity. Since we all know that whatever he claims to be inside he could not possibly be a Dragon actually on the outside.
He sounds to me like an RPG'er of the lowest type, trying to justify his ideas and his own insecurities by frightening others.
Either way he just showed himself up to be dumb.
If you can just forget about him.