Bid'ah which are forbidden are bad innovations. Even Hazrat 'Umar when he instituted the taraweeh prayers in the masjid was engaging in bid'ah, which he described as 'good bid'ah.' there is a difference.
Little knowledge is a dangerous thing. 10-13 years ago I used to spout anger, judgement, fatwas just the way I hear them on this bulleting board now. I grew out of it. Also, I studied Qur'an, Hadith, fiqh and Ijma' more, and I travelled. Islam is universal because it is not a rigid plank of wood. It is a living, organic, adaptable thing. There are many things that Pakistanis-whether wahhabi or not--do which Saudis, Malaysians, etc would never do, and would consider unislamic. Interpretations vary, - they varied even among the sahaba.
An Islamic leader of the last century once visited a masjid during Ramadan. The people starting squabbling over whether to pray 8 rak'ah or 20. He said, "taraweeh is sunnah. but unity among the muslims is fard. pray at home if you quarrel about this issue."
I disagree with the wahhabi method of discarding all the scholarship of the centuries of islam. i disagree with the way many wahhabis are arrogant - "no scholar's gonna tell me what to do! i've got Qur'an and Hadith!!" --as if Qur'an and Hadith were like a primer. The Qur'an is of amazing depth. years and years of study and you can still only hope that you comprehend a fraction of what Allah tells you in it.
But though I disagree with wahhabis, God help me, they are my brothers and sisters, as are sufis, shias, and every other human being who says la ilaha illallah. God protect me from ever pronouncing judgement on anyone who says those words. - My judgment would come right back to me.
If we disagree on something, - let's agree to disagree. Fighting about it never changed anyone's mind. Mention your ideas; maybe years later, the other guy will agree with you. That happened to me.
And recommended reading:"The ethics of disagreement in islam" by Taha Jabir al-Alwani. It's online too.
salam.