It's ebonics, a slang or dialect version of using "are."

Linguistically it's particularly interesting since it marks the habitual aspect, and standard English has no grammatical equivalent.[0]

[0]: https://ygdp.yale.edu/phenomena/invariant-be#who-says-this

And it's more like "are being" here (present imperfect)

Ebonics, from the root ebony, meaning black-speak? I can't believe that's still acceptable.

sometimes it do be like that

a) This was probably just a typo for "being".

b) Hey but at least you can learn something today: https://en.wikipedia.org/wiki/Habitual_be

Thank you.

Isn't it just slang? Foobar be like ...

i’m thinking it’s an intentional turn of phrase

so for example in native English, if someone upset some people, you might say, just to be creatively different:

“oh boy. people be big mad”

it is an idiom, not necessarily officially part of the language. just saying things in a silly way to be different

“now you’ve done it… People be cryin’!”

I think it might also be an echo of pidgin English/Creole/caribbean English? Would be an interesting language dive. Ask an AI!