Is it mean to call other languages "gibberish"?

I like to say, "if I don't understand it, it's gibberish". I am just kidding of course, but would that offend you if you heard someone jokingly saying that

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Tumbleweed · F

Don't say that to someone's face. It's rude.

Sweetguy024 · 36-40, M

@Tumbleweed I definitely wouldn't. I just thought of it when I was at the store and people were talking in another language. I thought to my self, "sounds like gibberish to me" and laughed to myself about it. I've also jokingly thought that my talk is gibberish to other people who I tried talking to but couldn't understand me since they didn't speak English.