Where I grew up, "supper" was the evening meal. Dinner could be the evening meal, but usually only if it was formal or big. It was a bit nuanced I suppose. You ate "dinner" out unless it was a quick bite to eat. Dinner usually refered to a cooked lunch (usually at home). When my parents were kids, everyone came home for "dinner". Farms, factories, quarries and schools allowed people to go home and eat with their family. Some didn't, but from what I understand, lunch wasn't provided at school until the 1960s. We always called what we ate on Sunday afternoon "dinner". It might be the Welsh and Irish influence on the area. The evening meal probably stopped being called tea when people stopped drinking tea after immigrating. Dinner stayed where it was, and "tea" became "supper".
My annoying phrase of the day is "oh well, never mind" used by someone else when you're upset. It's so dismissive.