Is "disproportionate" word correct in this context or should I use other?

Question

Imagine the next situation, I am talking with a friend about this article: Haiti: photojournalist shot in face as senator opens fire outside parliament ...:

Friend: Ehh, Did you read this one?

Me: Ahh yes, I read it this morning.

Me: I think his reaction was disproportionate, he could has handled the situation in a better way ...

Disproportionate means:

too large or too small in comparison to something else, or not deserving its importance or influence

• There are a disproportionate number of girls in the class.
• The country's great influence in the world is disproportionate to its relatively small size.

Source: Cambridge Dictionary

I am using disproportionate to refer an action of him, I am not talking about: shapes, numbers (for example: ehh look that team is disproportionate, it has the double of players than the others), ...

So, as I asked: Is "disproportionate" word correct in this context?

Answer 1

It's fine, although I think you need to better define what reaction was disproportionate, and how it was disproportionate. For example:

Drawing a handgun and firing randomly into the crowd seems like a disproportionate response to the level of threat. It doesn't seem like he was in any real danger.

Also I think you mean to say "handled", not "lead".

I think the senator could have handled the situation in a better way.

Answer 2

I think that’s a good choice, especially noting that the senator remarked

“Armed individuals threatened me. It was proportional. Equal force, equal response.”

You could say it’s a bit of wordplay.

However, as the entry shows, you can/should use to to indicate what it’s relative to. For example,

I think his reaction was disproportionate to the alleged threat.

I would say that “disproportionate” is a tad on the formal side. If you want an common, slightly less formal word, consider overreact:

• overreact
  : to react to something too strongly : to respond to something with too strong an emotion or with unnecessary or excessive action
  // I was furious and yelled at him. He told me I was overreacting and to "chillax."
  — Ben Stein
  (M-W)

• overreact
  Respond more emotionally or forcibly than is justified.
  ‘the Authority are urging people not to overreact to the problem’
  (Lexico)

Example:

I think he overreacted. He could have handled it better.

Answer 3

I don't feel like disproportionate is the best choice here. How about uncalled-for:

his reaction was uncalled-for, he could has lead the situation in a better way

Also, I'm thinking of excessive, but I'm not sure if it fits the context.