Depends on which "several large personalities" you're referring to. Perhaps if you specify, your curiosity will be sated.

I am curious in general, as it is often noted that there is a trend in open source development communities to be hostile to end-users.

If pressed for specifics, Linus Torvalds and Theo de Raadt come to mind as a couple that are often called out for their abusive behavior.

In those cases, the difference is that the end result of the projects they command - Linux and OpenBSD, respectively - are free software, and therefore ultimately respect the user by providing said user with the various essential freedoms. This is in stark contrast with Oracle's software products, which are not only proprietary, but repressively so.

The hostility is also usually confined to those on the development mailing lists of those respective projects (which are implied to be meant for developers, not end-users). It's also with full understanding that - if someone doesn't like how Torvalds or de Raadt run their respective projects - they're welcome to fork (even if said forking rarely happens in practice).

The reason why I pressed for specifics is because there are some personalities in the FOSS world who - while still not in Oracle realm of dickery - probably would come close if given the ability to. Mark Shuttleworth comes to mind, being outright hostile to user feedback on things like Unity, Mir, the Amazon Shopping Lens, etc. (as opposed to the interdeveloper harshness characteristic of Torvalds and de Raadt).