I'm not quite sure why people are asking them to join an RP server when they have no intentions to RP. I suggest you roll on a non-RP server. OCUK as a kinship name maybe altered too as it may not fit the Lore (if someone reports it, it is likely to be altered) there are plenty of non-RP server's for players to join!.
The reason you get reactions like that is they want to protect their server from people who have no intention in taking part.
The OCUK kinship name isnt OCUK though.
You dont have to RP to be on the RP server, you've never had to RP on any MMO RP server, you just have to respect that others might RP on the server and not disrupt/insult them for doing so.
I do a little RP from time to time, but the reason why I joined the RP server , and the reason why I joined RP servers in every other MMO, is because generally speaking I find the RP server communities to be a touch more mature, more helpful and I also find all the various RP events run by guilds really help to flesh out an MMO.