If people followed this dictum, there would be no internet. Well aside from porn.I think there's a dictum (or dicktum in their case) quite a few people on this forum need to consider - 'if you haven't got anything nice to say, don't say anything at all'. Nasty people.
To OP, all the best with your ventures.
I do agree that criticism should at least be worded in a funny or light hearted way. Taking the piss is it's own art form. I'm sure most of the responders mean well enough.