That may be, for genuinely bad ideas, but that is not really the issue here, which is the summary dismissal of something without due consideration, and, more generally, the predisposition to act that way.

I have seen good things dismissed because the critic has some arbitrary standards of style, or is disinclined to make an effort to understand the implementation, or has failed to learn enough about the problem domain to understand all the complications, or wants to rewrite from scratch because "I'm a software engineer, not a maintainer", or "not invented here", or to lower expectations, or to intimidate and dominate... To be fair, at some time or other I have been guilty of most of these things.

I suspect that college sometimes gives people the mistaken impression that analysis and critical thinking (and being smart) is all about picking apart someone else's thoughts, but it takes more than that to create something worthwhile.