Guidance does not mean “its my way or the highway” or in this particular situation, “the shidduch we want, or none at all” (some older singles claim this is THE root cause for the “shidduch crisis” – but I do not want this thread to turn to that discussion).
The bigger questions are:
1: Are the parents being honest enough with their own child to assure that the guidance stems from whats best for the child and not whats best for their image?
2: Is the son/daughter mature enough to understand the parents position and are they confident enough in their decision to go ahead despite their misgivings?