Wally on page 327
Ah, and now we know why Ash has only one 'first and best' friend... and now she's doing her best to destroy that special friendship. Charlie has been a pretty good friend too. Helping her while her arm was recovering from the Doctor's needle in school and carrying her, bare footed across sun baked black top so she wouldn't hurt her cut foot... There were lots of things that Charlie did for her in the few days they've known each other that should make her realize how a good friend should act. If only she would stop and think before reacting so emotionally.

Joseph on page 327
Humans are driven by emotions.
It is our emotions which provide us with a rich set of complex bioinformation about our perceived needs.
They are pointing to something.
If I had to guess, I'd say that Ash probably interprets (thinks) of Charlie's responses as uncaring and cruel -- that she probably [mis-]interprets his intention as a desire to create pain/suffering, RATHER than a desire to connect and have equality, peace.
When our needs are met, we experience emotions.
When our needs are unmet, we experience emotions.
How we think (perceive, interpret) about our observations, and others' intentions, ultimately leads to how we feel.
I believe we are always feeling *something* — whether conscious of it or not.