This doesn't really explain any hostility towards open tools but it does explain much of the preference for certain well established commercial packages:
The commercial software vendors do a great job of marketing to engineering schools and students. Once you learn some software it's a lot of work to relearn. So if you get people accustomed to your proprietary ecosystem early in their schooling and during the start of the career, you have pretty much hooked them for life.
If that were the case, most of the (academic) software world would still run on Matlab and Borland. Instead, Python has completely taken over that space even without salespeople to push it.
Most of the open source CAD stuff is just Not That Good.
The commercial software vendors do a great job of marketing to engineering schools and students. Once you learn some software it's a lot of work to relearn. So if you get people accustomed to your proprietary ecosystem early in their schooling and during the start of the career, you have pretty much hooked them for life.