It's a video game where clowns viciously stab people in the eyes with a bananas whilst causing serious brute damage, and where if you lube the hallways the station's warden will break your legs for it (literally; presuming admins gave permission).
You rarely see people who use games from fictional content or video games. You see even more rarely people, that actually roleplay as the character from the fictional content or video game. Yeah, like Fox McCloud said, things such as greytide are a much bigger problem than someone going around as "Dr. Rockzo, The Rock & Roll Clown" whilst screaming "I LOVE COCAAAAINE", because something similar probably happens only once in a dozen rounds, and even then you will not notice it because most of the time the server's population is above 90. That's a lot of people.
If this really grinds your gears (I'm talking for myself here, this is only my opinion) as badly as I imagine, you should pull a stick out of your ass. I don't mean that in bad blood, I just want to say with that idiom that things are a lot more enjoyable most of the time when you turn down the knobs on "serious" a little bit. This is coming to you from a person who often is a super big hardass and loves heavy roleplay, but still plays on Paradise despite someone running around as "Bobby Hill" to stomach knee people with "sleeping carp" whilst yelling "I DON'T KNOW YOU".