そんなしゃべり方してたら頭悪そうに見えるよ？の英語

You sound like an idiot if you talk like this.

It really gets to me [makes me furious] when he insults me [talks to me] like that.

I'd say you're sick if you do something like that.

It's very vulgar of him to speak like that.

Can't you even understand that, you dumbass?

I should feel hurt to have such Things said of me.

He gravely says such absurd things.

Such conduct on your part would be disreputable―scandalous.

Unless you prefer talking like this, you can speak to me casually.

I suppose the story sounds absurd to you.

It's bad manners to speak with your mouth full.

That's painfully true.

Hey, are you remotely sane?!

How do the words sound to you?

Heaven will punish you for saying such a thing.

Watch your language or you'll catch it!

You'll be in trouble if you're not careful about your language.

It sounds strange from your lips.

I'm sure you must have been [I'm not surprised that you were] offended by his unfair criticism.

Do I look that stupid?

That sure puts me on the spot.

What do you think about that fuckhead?

Such arguments make （not for, but） against your interests.

If you don't shut up, I'll give you what for!

How can you tell such a story with such a grave face?

You should be grateful to me for listening to you so patiently. That's a totally absurd and stupid story!

I like the sound of what he says, but it IS just talk, you know.

You shall smart for it.

If you keep saying senseless things, you'll eventually be sorry for it.

I'm going to make it hot for anyone who will say bad things about you.