It's not. But I believe I was fully justified to flag for spamming another steem related service.
Someone being new doesn't excuse their actions. A chat room is for chatting, not going in, dropping a link, and completely ignoring everyone. It even says at the top that promotion isn't allowed.
You can forgive whatever you want of someone for "being new" and "not knowing any better" but I am not required to. I am free to use my vote and flag how I wish, including to flag for spamming their link elsewhere.
My bad, I did not realize you owned the chat room or were the admin for it.