What Duel said. (He always has a way of addressing the topic directly and explaining it reasonably)
The thing is, some of us may use blocked words irl out of habit. But...
Maybe the deeper issue is about how we express frustration in words. Funny thing is, those words change depending on who we're around (i.e., we tend to choose not-so-harsh words when we get upset around someone respectable). If that's the case, then I'd say that everyone has the capacity to hold their tongue depending on the situation. If the situation is an online environment that involves a filter, then people should consider that or adjust to that. As Jaeger said once on /ch g, (and what GG and Max touched on) we gotta "get creative"/find other words when we're tempted to say a blocked word on chat. In the rare chance I vent on chat, I think I tend to use a simple "gah!" in a frustrating situation ...where the number of a's is directly proportional to how upset I am.