No.
The answer to people behaving badly is not, "get over it."
Some are, sure... But, if we were really all that open... why do we have a special word for our not being open?
The stories of women and PoC who feel the burden of having to prove they are "real geeks" stand in stark contrast to your report. So, color me skeptical that we are really all that great at it.
All I can say is that in my experience with open public campaigns, pretty much everyone has been welcoming of a wide variety of people. There are jerks everywhere, of course.
Online forums tend to be toxic because of anonymity. That's hardly unique to D&D.