Weddings. I mean, the big fancy £20K+ marathons that go on from midday to midnight.. 💤😴
Boring as fuck, and involves a lot of hanging around for HOURS, bored out of your skull, and trying to make smalltalk with people you don't know, or you don't like. Nearly always 50+ miles from home, so you are spending shit loads on a taxi, or a hotel, or unable to drink all day, as you're driving back home at midnight...
Spa Days.... Just shite. Waste of money.
Sourdough - gross and chewy. Croissants - gross and chewy. Prosecco - fizzy piss.
Being in social gathering groups. Always at least 2 gobshites who take over every conversation and love the sound of their own voice, and cliques form, that a few people in the whole group are not in, so they feel excluded, and there's always at least one spiteful bitch - and it's not always a woman!
Alochol - very expensive, gives you a headache/massive hangover the next day, makes people behave like idiots, and is not needed to have a good time.
Being promoted at work - more money yes, but more responsibilities, longer hours, and more student fees, pension, tax, N.I. taken out of your wages, so not much better off anyway! Better to stay on the lower half of the ladder.
I am sure there are more!