Blocking member on forum?

Is it possible to block somebody to prevent them from posting on any of your forum posts?

There is this member that replies to some of my posts and, although I appreciate their support, they are often not good at being empathetic.
Therefore I am left with replies that seem insensitive, which worsen my feelings.
I vented last night about my agoraphobia and this person trivialised my pain and told me I can "overcome my pain" (kind of like when people tell those with depression to "cheer up").
There was another time I vented about my agoraphobia and the same person told me to "grow up".

Once or twice I can forgive, but this has been the third time this person wrote to me.
They probably do not know that they have written to me this many times, because I tend to alternate posting in between my listener and member account. Regardless, I'd be in a emotionally better state knowing I never have to read this person's replies ever again.

Anyways, if any solution can be suggested, it will be greatly appreciated.
Thank you.