Conversing with a pro-SSPX apologist, I was basically told that the Novus Ordo mass is not only illicit but also invalid as a mass. Which implies that it is basically sinful to attend.
The arguments include that the Second Vatican Council had some heretical statements (To which they say the entire council is akin to personal opinions basically), the promulgation of the NO was not done in the proper way, and that it violates the previous papal declaration that the form of Mass was not to be changed.
Is there any truth to what they say? (I had the reaction to be skeptical of those claims and understand it’s best to avoid SSPX, however this is an ongoing conversation we are having that I placed on hold)
If not, how would one go about responding to these claims?