Being offensive isn't against the rules.
And dude, you're starting an IPO, you're going to have detractors, some won't be very nice about it. Reacting the way you are is just suspicious as hell. But yes leaving is probably your best option, you need to develop some thicker skin.
This is one of the weak points of the moderation.
Yeah being offensive is not against the rules, but there needs to be a limit. Being a little offensive okay, but attacking one multiple times in a thread is definitely not okay.