Oh and Remmelt, you wanted clarification on why I see those examples as insults (as opposed to constructive debate). It's an interesting question and I think the answer for me is often, "You use descriptors with only neutral or negative connotations without being specific about the accusation." Which makes it hard to progress the disagreement and simply leaves people feeling negative about the subject.
For example, to just take the first quote: "I personally have tried to be reasonable for years" implies that people have not responded appropriately to reasonable disagreement (rather than simply not finding your arguments persuasive); "social cluster" sounds like an accusation of harmful nepotism; "monolithic" has negative connotations but I'm not sure what the specific disagreement is; "assumption" suggests an absence of reasoning/argument; "do good" in inverted commas to me is mocking, saying that not only are they actually doing harm, they're not even trying to do good?
IMO it would have been much better to say something like, "The fact that X is friends with Y creates a conflict of interest that makes me more skeptical of claim Z" (and preferably some recognition of something positive but I know people only have so much time and energy) or to not write the tweet at all.