This is one of the few circumstances where I support the filter and want it enhanced.
Currently, it is nearly impossible for members of my group to have a disturbance-free experience without having to ban newly-made accounts every five seconds because people think its hilarious to bypass the filter and make stupid usernames. I would post examples but given this is a public section of the forum, I will not.
The point here is, I’m proposing that the filter specifically for usernames gets enhanced. People are getting away with bypassing the filter and making disgusting usernames; the moderators of my community are tired of having to ban them consistently (25 bans in under 5 minutes, for example) and I’m sure the effect is felt in other places.