This is a false equivalence. "What constitutes appropriate humor" versus "Government silences dissent." Just because the Diabetes conference cited their code of conduct doesn't mean that's actually what this is about.
This is what people seem to get mixed up about the First Amendment to the US Constitution. These scientists were removed from the conference because they were highlighting the scientific role to push back against government censorship. Not because it wasn't germane to the conference, but in furtherance of the censorship itself. The US Government participated here indirectly via its chilling on scientific discourse.
Comments in this thread suggesting that "this is just some private actors" are mistaken. This is absolutely the consequence of the Trump HHS policymakers decisions.
I was under the impression that the First Amendment means that the government can't arrest you for what you say, not that it lets you talk about whatever you like at a conference organized or supported by it. Nevertheless I understand the urge of those guys to have their voices/ideas heard.
For what it's worth, ADA has released this press statement [1]:
> As a 501(c)(3) organization, the ADA has safeguards in place to ensure that it complies with all IRS regulations. This includes maintaining a strictly nonpartisan environment at all organizational events and functions while engaging across party affiliations to advance our mission. We have always, and will continue to welcome scientific inquiry, respectful dialogue, and diverse perspectives in the pursuit of better outcomes for people living with diabetes and obesity.
[1]: https://diabetes.org/newsroom/press-releases/american-diabet...