"because in one message this thread has turned sour for me, and I don't even know why?"

That's easy. Noone intended to attack you. This is the nature of virtual discussion - without body language and tone of voice symbols, communication can go awry and misunderstandings occur. I expected some confusion with viol, viola, violin, especially among the less experienced.

I have just been trying to remove the unwanted full stop in a sentence. to find out that my laptop screen has now just developed a 'dead pixel'.... sigh ...