بسم الله الرحمن الرحيم الحمد لله والصلاة والسلام على رسول الله وعلى آله وصحبه ومن والاه وبعد السلام عليكم ورحمة الله وبركاته
Here is a beneficial extract from the excellent book of Shaykh Ibrahim Ar-Ruhaylee hafidhahullah entitled "The Position of Ahlus Sunnah from the People of Desires and Bid'ah"
quote:
"The marriage of Ahlul Bid'ah to Ahlus Sunnah is in general prohibited because of that which arises from it of great corruption, and it negates that which is SETTLED UPON IN THE SHAR'IAH(legislation), from LEAVING OFF THEIR FRIENDSHIP and LOVE and it is a MUST to BOYCOTT them and DISTANCE ONESELF from them.