What is Erik's demeanor when he tells his mother about Mike's death and how does this compare to his conversation about it with Arthur?

Erik's attitude when telling Mike's death to Mike's mother and talking to Arthur is the same. He talks about this death laughing, making death a joke.

Explanation:

Erik is an extremely insensitive and psychopathic character, as he sees Mike's murder as a mere joke. He tells Mike's death to his mother and Arthur with lots of laughter. He finds Mike's younger brother's desperation at the knowledge of death very funny and spends a lot of time splitting Mike's cruel death as something fun and funny. This insensitivity of Erik, is a point very explored in "Tangerine."

you have three options. first, you can delete the instagram account. two, you can change the handle, username, and profile photo and make the account private. finally, you can just confess. there really is no point in lying to them.