The general guideline in such cases is a “reasonable” person. You could also measure it as the percentage of people in your specific community willing to flag something as offensive or objectionable. Different communities have different norms, of course, and some might be more sensitive or less sensitive.
So, always have good intentions – that to me is what this text is about – but don’t hesitate to throw the post out there, and react accordingly.
It’s the people with bad intentions that we worry about. Honest mistakes are fine and can be recalibrated.