Personally I can see it more being a matter of unsportsmanlike behaviour which, granted didn't get too out of control, isn't punishable.
It wouldn't go unnoticed if unsportsmanlike words such as eZ were blocked by the filter as well- it's a 2 for 1 deal when you think about it; not only are we blocking out the words in the first place, but people will be punished if they try to be smart and evade the filter (which is punishable).
However, at the end of the day this all depends on the administration's standpoint on the issue, which last time I checked was that comments like eZ aren't a problem.
Unsportsmanlike conduct
is being disrespectful, though - where does the intent lie? I'd doubt most do it to exercise arrogance.
I really haven't ever been in favour of making it bannable, but now I can see why the demand is there. It really is just disrespectful and, as most seem to put it, 'unnecessary'. It literally says in the rules ("Do not disrespect others [...] Eh: User, you suck at Minecraft.) That example is, arguably, the same as 'eZ' or 'l2p'. The written rules basically head most of my arguments, which is scathingly ironic...
Also, I fail to grasp what you're trying to say in your second paragraph. Block out the terms in general and punish people of they bypass the filter? That really makes no sense to me, because it'd be absolutely no different from now. Filters only can do so much, and at the end of the day, they really protect against nothing.
It's not so much that I see these subtle digs at mockery and condemnent as a problem, but more that it's just a completely unneeded, unwanted, and literally a scum comment.