When there is someone who makes a fuss about meaningless stuff, escalates issues when there is no need it can be because many different things. Could be that priorities were not set or understood or because they do not want to bring to the table important topics to be discussed.
Make a big deal of irrelevant things, makes very easy to start a discussion that’s tends to go nowhere, upsetting whoever is involved. And we leave out of the picture the important matter. It can happen once, but if someone insists on coming back to an irrelevant, provocative topic it is not a mistake. They rather talk about anything else but the important thing. Important things require understanding, patience and mutual respect. Not everyone is up to it.