You're entitled to an opinion about it, but a Slack bot that pings you when you say "guys" is not remotely comparable to bullying (which is the top-level claim in this thread).
> I have never seen or heard someone chastised for using “guys” informally
A bot that is doing this is tantamount to a person doing it, since a person made the bot and a person installed the bot.
That's not a ping, that's imposing your language on others. A ping would be something like "guys is a gendered term for some people"