Stop being so insulting. I am not born and bred Dublin, but I live here and it's nonsense.
I have no problem with people not liking a place - that's to be expected - but sheer ignorant commentary is another thing. For example, I love London, have friends who really don't like it and don't enjoy visiting.
Yes, there are stag and hen parties though I rarely see them - or at least the type you mean, loud and raucous. They'll be based in Temple Bar usually and it's absolutely possible to be out in Dublin and enjoy a great evening away from that.
It is expensive - but actually I think it is better value than other parts of Ireland as you often get meals etc that's worth paying the money (unlike e.g. West Cork where I also spend a lot of time, and love but often find staggeringly expensive for not wonderful cuisine). I don't think it's more expensive that other big cities.
No idea re: drugs or what part of Dublin you live in / visit - I have never seen drug taking or noticed it as a significant issue in 20+ years living here.
It did get run-down during Covid, was quite derelict looking and rough, lots of shops closed, it wasn't well-maintained. But it's absolutely picked up from that now, and when I was there a week or so ago, I would say it felt back to normal.