Is using the phrase”OK boomer” in the workplace inappropriate and a sign of ageism?

I would recommend everyone not to use it. “Okay, boomer” is an insult. Although it’s a very light insult to the speaker, it’s not to the receiver. I mean, it’s intended to hurt. We weren’t allowed to call someone lovely at my previous job since it was considered sexual harassment. If “Okay Boomer” gets popular, it’ll be regarded as ageism. The term was used on me lately in an insulting and unacceptable manner. My reaction? ‘ I said that’s okay. You’re biased toward older folks and like to pretend they’re all stupid or useless.’ In another example, I just said, ‘don’t call me that again,’ while in another, I said nothing.