It's such a fine line to tread on emotive subjects like these - between being emphatic about your belief, and insulting someone with that emphasis - and possibly not actually meaning to cause offence.
And that is the problem with social media. The written word is taken at face value in a way the spoken word in a physical group is not, when you can see the person you're communicating with, and there is space and time to clarify or qualify what you say.
But, compared to some other SM sites, GN is, generally speaking, a model of restraint and civility. At least, that's my experience.