Is it possible to be racist towards a majority or typically 'in power' group?

Racism is about prejudice and discrimination against a person based on their skin colour, ethnic background or nationality.

It has nothing to do with "power", or whether a person is in a majority, primarily because then you're assuming that a people are in power across the entire world.

Trying to redefine the term is a common tactic by someone trying to play the eternal victim.

But here's the thing, what do you do when the power structure of a country ACCEPTS your argument and acts accordingly?

Positive Discrimination is a fine example. Western governments put policies and laws in place which directly advantage minority groupsd. That is POWER being used to exercise a prejudice. That, but the attempts at trying to redefine the word, is an example of empowered Racism against the majority.

Yes. Of course.

Yes, because you attack people or treat them badly, regardless of their social status.

Not likely at all but in some individual circumstances; it's possible.

Yes