I sincerely hope that atm, if someone unintentionally misgenders someone, and the issue is raised to HR (People Dept?), it'll simply be a quick phone call reminding the "offender" to mind their Ps and Qs.

However, it appears that if it's a case where they are deliberately misgendering another, even because of a sincerely held religious belief, then they are on definitely a slippery slope wrt to termination.

https://www.jdsupra.com/legalnews/what-can-employers-do-about-employees-6007132/

If you have to die on a hill, make sure it's worth it.