I feel like you miss the point I made and what I believe others are trying to point out. So I'll try approaching it from another way.
You point out how your name is a reflection on your taste in fish and fish tanks. And use the fact that we are on a aquarist forum seemingly implying as though it should be a logical conclusion yet you won't give MFK and it's logo the same kind of leeway.
There's no need for a poll on how your name might be construed because there is testimony here that it could be seen in multiple ways. Sumo interpreted it one way and even you knew it maybe interpreted another way as is stated in your response to Sumo. One I can attest to, regrettably which also testifies to my immaturity at times; initially interpreting as it being a phallic reference. Which I believe is the very interpretation you thought it maybe taken that you where referencing in your response as dirty/ silly.
You say MFK's logo is a company statement and is why you view it differently then your username. But isn't a username a statement? A person chooses it, and there are definite reasons for their choice. Such as how they want to be perceived. Isn't that the same kind of statement you're saying MFK's Logo is?
You also seem to believe CheeseZ username is a statement. So why does he bear the same responsibility you feel MFK does? But you seem to feel that you don't? At very least to the same degree as MFK which is the same level you're trying to apply to CheeseZ. While you feel your username is trivial. At least it's origin. This is despite the fact that you have become a well known member and may be seen as a role model. At least that's what one may construe from what you've posted thus far.
Who decides when and where such a responsibility begins and ends? When are people responsible for themselves and their own interpretations despite the intention of the poster or site?
While I see your thoughts and agree with most of them, I'd like to simplify and focus the debate as it's getting too complex and diffuse IMHO.
All I am saying is that MFK logo and personal avatars and personal screen names are public statements (just like the words we type up). There are rules for behavior in public, accepted in the society at large. The statements made in public should not contain derogatory remarks or insinuations, not to mention open and earnest insults, based on other people's faith, race, skin color, gender, age, etc., you know, the standard list.
If it is deemed that they do contain an offense or a veiled offense or a possible offense, the staff can act or the members can petition the staff to act.
[1] No one is bothered by the MFK logo but me out of this crowd so far. I am nobody and, moreover, I reckon this is Neo's almost personal site and project that we all, myself included, should feel privileged and lucky to have and to hold and be thankful for what we have and not hung up on what we don't have. So I choose to ignore the logo and that's that. Even though Neo is not following his own TOS (in my humble and worthless opinion), this is Neo's call, not mine.
[2] The screen name of the member in the OP question does not bother anyone but me plus perhaps one more member. I hold an opinion that if an avatar or a screen name CAN be more or less readily interpreted as being against the aforementioned societal rules, TOS, and T&C, the member should be asked to change it / edit it. You all convinced me this screen name is far from being readily interpreted as breaking the rule. Fine. Thank you.
[3] If my screen name CAN be more or less readily interpreted as being against the aforementioned societal rules, TOS, and T&C, I will be more than happy to change it. I don't consider myself exempt from this rule.
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In sum, when people break these rules with their words, their posts and threads get deleted. A similar approach should be applied to logos, avatars, and screen names.