Is this considered work discrimination?

If you hear another employee making fun of how another employee of a different, culture/race talks, is that work discrimination or something else.

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For example

They hired a new supervisor for the night shift at my job and another supervisor was talking about her amongst another employee saying “The new supervisor, I never understand what she’s saying. She speaks “Says something inaudible.” Basically saying she speaks jibberish, which she doesn’t her accent his just different because she isn’t American, and then she laughed about it and I thought it was weird because I understand her completely and she’s nice.
Is this considered work discrimination?
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