Those who traffic in labels such as "Mentally Ill" often use them as an excuse to categorically dismiss every iota of dialogue produced by a person
Those who live outside the normative view of the majority are all too familiar with the sensation.
They hear you speak, but do not understand your words.
Do not fall into the assumption that this couldn't be you. Always be aware of when you have shut your mind to someone trying to communicate. Never fail to ask yourself why that is.
Compassion requires that we listen; to ourselves, to our comrades, and most especially those we would rather not hear.