Tenses

A: Why don’t you want to race him?

B: Because I [color=red]choose not to run!

[color=blue]Is it right to use the present tense “choose” here?

[color=orange]The following is from Seinfeld:

Mrs Choate wears a look of shocked realisation. She stands and addresses Morty.

MRS. CHOATE: It’s him. (pointing at Morty) It’s your son. Now I know where I saw
him. He stole my marble rye.

MORTY: My son never stole anything. He’s a good boy.

RALPH: They should lock him up.

MRS. CHOATE: (pointing at Morty) Like father, like son. (thumps table) I [color=red]change
my vote. I [color=red]vote to impeach!

BUILDING B: Me too. I [color=red]change my vote.

[color=blue]They use “change” and “vote” in the present tense to make a declaration, don’t they? What if they use “I’ll change my vote”, “I’ll vote to impeach?” Does the present tense make the speaker sound more decidedly?

Thanks

Is it right to use the present tense “choose” here?– Yes, it is OK. His decision remains firm.

They use “change” and “vote” in the present tense to make a declaration, don’t they?– Yes.
What if they use “I’ll change my vote”, “I’ll vote to impeach?” Does the present tense make the speaker sound more decided?– Yes.