I keep thinking that auto-censoring to gain some sale isn't a good thing. That line amused a lot of people (me included) and as you'll always offend somebody at some point, specially when you play with humor, I think that playing as far as you feel like is the way to do. It keep the thing spontaneous and that the strength of that project, natural joke quickly implemented and that amused and talk to the target.
------ Re: my 'aggressiveness.'
Abt the "Dickhead" word, I have no idea if it's a casual or a tough word, as a non-native speaker I can't really say, and I don't really care, was more the tone that bugged me, but as my first reaction wasn't really well formatted either, let's say it was certainly well deserved, the "get over it" wasn't a good thing to write, I agree. .
And I am sorry I called you a name that added nothing to the discussion. It is not a 'casual' word, but I have a very developed vocabulary of obscenities ;-) - so it was just the first thing that came to mind that I thought would make a point about offensiveness and your tone bugging me. In any case, it was flippant and I regret it.
Re: auto-censoring. I may be completely wrong about the lines...I thought they were mildy funny, just not worth losing sales over. It was just a suggestion. If it were the OP's actual stance/belief on something, then that's different. I just thought he could put in something funnier that wouldn't necessarily be creepy to anyone. I have a different perspective than most, maybe. My companies have (aggregate) revenues in the low billions, so a small tweak can be a big thing for me. I don't want to offend a customer unless I think there is a good reason. I started out with exactly this kind of small, opportunistic approach as the OP's t-shirt, so I thought I might have something to contribute. I was apparently wrong.