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human
CMV: It is acceptable to address a group of mixed or single gendered people as "you guys" without being corrected

I don't see anything wrong with saying "you guys" when addressing a group of mixed or single gendered individuals, regardless of the gender of the person saying it. When I say "acceptable" I mean these words should be accepted in colloquial speech without being corrected or labeled as non-inclusive language in a professional setting.

This stems from an incident I had to deal with at work recently. One of the reps on my team (female) kicked off an internal call with two interns from a different team (both also female) saying "hey guys..." which wasn't acceptable for the two interns as they abruptly left the call 2 minutes later.

The two interns then went to our CEO and filed a complaint that the rep on my team had used non-inclusive language and that they would not return for full time work if this wasn't addressed. They initially tried to argue it was hate speech, until HR corrected them on the definition of hate speech and then suggested it met the criteria of non-inclusive speech.

As a result, the past two weeks her and I have spent 8-hours/week in diversity training with an "inclusion coach" virtually in addition to her and I needing to meet with our Head of HR 1-1 to talk about "milestone achievements". Our Head of HR has subtly reminded me that my 'inclusive EQ' has been reduced based on my race and gender, and lack of reminding my team to be mindful.

The rep on my team who used "you guys" is absolutely mortified, but also angry as she is a female, both interns were female, and to her this was an informal way of starting a discussion. I fully agree and have had her back the whole time. We work in Silicon Valley tech sales where people over rotate on these types of things, but never thought it would push my best rep out of the company. 

Aside from that anecdote, the definition of non-inclusive language is: "any language that treats people unfairly, insults, or excludes a person or group of persons". I don't believe "you guys" fits this definition given the situation and context, and also don't believe it should ever be applied situationally to any person based on their gender.
gpt
"you guys" is an accepted gender neutral way to greet a group of people informally. If someone has an issue with the term, they should express their discomfort, and you should proceed with different language. If they immediately left call without an explanation, there was a failure on their part. If you proceed with this language twords them specifically, there will also be a failure on your part.