It totally depends on what kind of person you are talking about.
Being accused of acting white certainly has is levels.
I've been accused of it and I admit to no such thing, I'm so proud of my culture and so comfortable with who I am. The reason I was accused of it is because I speak out (respectfully, never ever disrespectfully) about certain things that aren't quite right in our culture, or perhaps I am less traditional and people take issue with that and call me "white washed" but I think thats just them being narrow minded.
I know there are people that are completely disrespectful about their culture, ashamed of their parents dress sense, ashamed of their language (so much so they refuse to speak punjabi etc even at home to their parents), they are racist to their race and I find those kind of people intolerable.
On the flip side, there are also people that may just be "a little too proud" that disrespect other cultures and races.
So basically, what I'm saying is, everyone is annoying :-D