They all make my teeth itch, no doubt you have your own phrases that make you somewhat uncomfortable...do share. There is a slim chance that some may listen :-/
I think both 'full stop' and 'end of' are a way of saying - 'I'm not asking a question despite the name of the site, I'm telling you what something is fool!'
I member my Mum went into Superdrug for me one day to asked if they had any hotwater bottles. The pompous manager explained rather brusquely that they didn't, and wouldn't be getting any in till winter time. Full Stop! Well, my mother was quite taken aback a bemused. I was not happy. We laughed about it after though. I think some people like the sound of their own voice.. ( Sorry to go on!)