Entitlement and, really, some of this crosses the line into bullying of the foundation and the maintainers, should be dealt with robustly. It will help to reset expectations around what's reasonable for the relationship of those developing LibreOffice with the community of users.
People need to recognise that they get a huge amount of value out of LibreOffice, for which they aren't required to pay a penny, so it's not unreasonable to be asked if they would like to contribute something back in return.
But amongst large populations of people, when it comees to free things, some portion of that population will always undervalue that free thing and fail to recognise how much benefit they get from it and start acting entitled. There's nothing wrong with calling that out.