How to not feel offended by comments/edits during manuscript drafting as first author
I often get the same feeling as you when receiving comments from coauthors. I find the key to not letting it get to you is to view it as constructive criticism and discuss the matter with that individual. Even incorrect criticism is constructive, as it tells you if your work is inadvertently challenging a common misconception. In any case, the solution is to have a level-headed discussion about it.
I came to this way of thinking when I realised I was doing the same thing as your coauthors to my students. It caused them an understandable degree of frustration. But, I was making those changes to the manuscript because I believed they would make the manuscript better. Sometimes I was right, other times I was wrong - but by discussing the changes we ended with a paper that really was better.
My point is that your coauthors are probably trying to do what's best for the paper. Sometimes those efforts might be misguided, but the point is that the intentions are good. I would thank them for their interest and their time, and then ask them to justify their changes to you.