Sounds like typical drivel from that Westminster cop. I've OC'ed down in Westminster as well many times (mostly while bowling at the Brunswick alley), and never had any issue. I checked the Westminster code after reading your post, and while they have an ordinance to forbid open carry in city buildings so long as it's posted, they repealed their old preempted laws sometime since 2003. And that's a fair amount of proof that while one goof of an officer doesn't want ordinary citizens carrying guns, the city knows what state law is and has been compelled to follow it.
Heck, it makes me want to head down bowling sometime this week!