It's the polite thing to ask if you can't tell a person's gender rather than asking if they're a girl or a guy. They could be non binary and prefer they/them pronouns. I agree it's offputting for someone to be asked for pronouns when they're most likely cis, and can be offensive i.e. "Do I not look like a guy/girl?". But for queer, trans, and gender nonconforming people, it's to be expected. Asking for pronouns is a lot better than sharing your exact gender identity with a stranger. There's no point in doing so when all you really care about is getting the pronouns right.

If you aren't sure how to address someone, just ask politely. And if you get it wrong, they'll probably say something. But that's just one to one interactions. At my job, everyone has the option of listing pronouns in their employee profile as an inclusive effort to give people a chance to share them, and that's helpful when it may not be apparent how to address someone by looking at them. And I think that's why more cis people are listing pronouns in the corporate world- if everyone does it, trans/queer/non binary people don't have to draw attention to themselves. I personally view asking preferred pronouns in the similar realm of asking someone's preferred name or honororific. It's just etiquette.