I think Leah covered a lot of it but I also think it's a personal question that every individual will answer differently.
I will usually only respond if I am familiar with the posters story. Sometimes I am time limited so can't respond, other times I avoid threads that trigger me, on any given day there are lots of different reasons.
I am sorry if I had happened to you and it upset you but I think what helps to remember is that it's nothing personal (usually) .

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