What you're describing is people who fail to follow the most basic principles of academic research. (Check existing academic literature, mention and give credit to prior work.) This would be fine if these people didn't claim to be doing scientific research, didn't boast their academic credentials, didn't publish their finding as original work and didn't demand credit for their work in academia. Of course, they do all of these things. They benefit from a system they're actively denigrating (and in some ways degrading).
To put it more simply, people with academic credentials should not demand acknowledgement of their current intellectual work while denigrating and ridiculing the importance of very similar work done in the past.
To put it more simply, people with academic credentials should not demand acknowledgement of their current intellectual work while denigrating and ridiculing the importance of very similar work done in the past.