Meaning of "a voice that is bright red"

I have come across the following passage below. I would appreciate it very much if someone would tell me what "a voice that is bright red" means. Thank you in advance.
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I’ve become so attached to my phone

that the sun no longer provides light.

I’ve become so attached to my phone

that I don’t know how to talk to my best friend

face to face.

It’s hard to socialize in person

but behind a screen I am powerful.

I have a voice that is bright red

that can scream at these

stupid blue screens.

I’ve become so attached

that it is starting to feel like I’ve become addicted.

I’m always on social media.

Constantly texting, liking, commenting.

There are days I cry, stressing about

how many followers I have

and how many likes I receive.

It’s like a job, keeping the data of

every single notification sent to me.

I’m lost behind this stupid blue screen.

I’m done with these stupid blue screens.

They don’t let me think.
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