Are you mocking his fatness?

[Tait-ka]

Today I saw a very fat man on a bike on road. Behind him, there was another man on a bike. That man behind was making a video of the fat man. I felt this kind of thing very inappropriate and insulting. I asked the video making man, "Why are you making a video of him? Are you mocking his fatness?"

Is the italic sentence idiomatic?

 

[Skrej]

It's okay, but it would sound more natural to say "his weight".

 

[Glizdka]

Not a teacher, just joining the question
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Would "Are you mocking him for being fat?" work?

 

[5jj]

It would.

 

[emsr2d2]

Also, it would be more natural to ask "Why are you filming him?" or "Why are you videoing him?"

 

[Tait-ka]

Let me clear one thing.... The bikes were moving, they were not stationary.

 

[Annabel Lee]

Would "Are you mocking him for being fat?" work?

Here's another natural option, which stresses degree of fatness:

Are you mocking how fat he is?​

 

[emsr2d2]

I find "mocking" rather old-fashioned, in BrE at least. I'd be inclined to say "Are you making fun of him?" or "Are you making fun of his weight?" In very casual speech, among friends, I'd actually say "Are you taking the p*ss out of him?"

 

[emsr2d2]

Let me clear up one thing - the bikes were moving, they were not stationary.

That didn't need clearing up. It actually doesn't make any difference whether they were all riding the bikes or just sitting on them (stationary) but I certainly assumed that everyone was moving.