Disrespect is part of progress, respectful humans are liable to blindness of flaws. Just as part of youthful creativity is disregard for what has come before.
It's a double-edged sword: ancestor-worship blocks progress, but throwing the baby out with the bathwater also blocks progress. Real fundamental progress comes from the tiny minority that avoids both.
If all disrespecting is to belittle and look down upon, then fair enough, I agree with you. What I meant, in perhaps an ill-phrased manner, was that overemphasised respect can often lead to stasis, where people might not want to change in case they are seen as disrespectful. Hence my use of disrespect, in that it is a relative judgement, and which can and has been used to discourage creative difference or just difference in general.