What group did Hitler feel was inferior?
He felt many groups were inferior - most specifically his anger or hate was directed toward Jewish or Gypsy people.
Humiliated, embarrassed, offended, devastated. Hurtful words can be considered as bullying, but many times when it doesn't quite seem like bullying, the person saying these things feel inferior to you and are only trying to make you feel inferior to them, which makes them feel that if you feel inferior to them, then you must feel intimidated or "lower" or not as good as them.
I'll try my best to explain :) No one can make you feel like you are worthless unless you belive what they are saying. For example, if someone makes fun of a grade you got, you could take it personally and feel inferior, or you could choose not to care and you wouldn't feel inferior; you wouldn't care.
There is no group or ethnic group called Aryan. This was made up by Hitler to give a false historical foundation for his master race to eliminate people he saw as inferior. There NEVER has been a master race and Hitler used Norse legends to create history out of nothing for the idea of Aryans. The white supremacy movement have carried on this false and ignorant use for the discrimination they foster.