Hi aldebaran,
Well, the proclamation of 'white power' is a familiar chant of skin heads, neo-Nazis and members of the KKK. If that doesn't give you pause as to why a lot of people think it's a 'bad' identifier, I'm guessing you just choose to ignore the issue, or you are ideologically aligned with one or more of those groups.
To pump one's fist and declare 'white power' sends the message that 'white people' are, in the matter of race, more powerful. For those who need to declare power, let's go with 'people power'. Let's all stand on the corner and declare 'people power'. Let our chant be that 'people' are more powerful.
White power is a slur against any race that isn't white. There's no problem with anyone being somewhat proud of their heritage, although even that should never come at the expense of someone else's heritage. Personally, I'm not particularly big on heritage, but I do realize that a lot of folks are. Question: what is 'white' power? When you say that to identify your heritage, as you say you would be using it, please explain what 'white' describes as a heritage? Then, if you wouldn't mind, explain what 'power' means for that heritage?
Let's go with 'people power'.
God bless,
In Christ, ted