Move flat? Lol
This is nothing. Throwing away shoes was over the line but angry people do silly things. Stick to living within your concrete cube and be grateful it isn't a noise issue.
You can never beat crazy.
It could be a lot worst, e.g. cockroach/rat infestation; screaming and loud noise etc.
If simply putting your shoes inside resolves this then go with that...
Hopefully it doesn't escalate too much... Crazy person sets fire to other person, accelerant under door and no way out...
Not many places seem to have sprinklers and smoke detectors...
https://www.scmp.com/news/hong-kong/...ire-their-flat
https://7news.com.au/news/vic/point-...mily-c-1705804