An internet discussion inevitably brings in people not only with different views but also different styles and intentions. It is not like being across a table where you know the other people involved.
Although I would like people to be polite, the evidence is that, in the heat of an argument, they often are not; while others enjoy the point-scoring kind of debate. I think Gransnet is, relatively speaking, well-behaved but, even so, you do need a thickish skin to persevere.
PS: I was interested in Daphne Dill's certainty about trolls on Gransnet. Having been on Daphne's suspect list after I joined, I wonder if I still am.
Just so as you know, I am just an old Grandad with a point of view on all sorts of things, not just politics. 