I always used to think you only use it in extreme circumstances- such as harassment.
I know there is a trend of some blocking others as a ‘fuck you’ in the heat of the moment.
To me, it seems like an extreme step to take but then I am not known for being great at putting boundaries in place with others.
I have never been blocked (that I know of) and have only ever blocked one person because of unwanted advances.
To me, blocking someone is final. If I took that decision, I’m saying I don’t want you in my life now or ever again. But I wouldn’t want to regret it, either.