What do these two personalities indicate?

[TheUmer]

Here are two cases:

1- A person is a writer. He writes on issues in an aggressive manner and an arrogant tone. But in his personal life, he's quite a shy and introvert kind of guy. What does this indicate?

2- Another person is a writer. In his personal life he talks big and is rather arrogant, but he writes very polite and rather romantic stuff. What does this indicate?

Any authentic help would be appreciated.