Do you think calling a person a loser is an ad hominem argument?

Donald Trump called Joe Kent a loser.

There is a difference between “threat” and “imminent threat.”

Joe Kent was the man who said Iran wasn’t an imminent threat to the USA.

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Donald Trump also called Joe Kent a sleazebag.
That sounds like another ad hominem attack to me.
Do you think calling a person a loser is an ad hominem argument?
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