Is this "normal" UK hygiene?

As an international student I have been quite shocked at some of the practices that I've seen, so I'm just curious as to whether these examples I've come across constitute normal behaviour in the UK, because where I come from (Singapore) most of these things would be completely unacceptable and people would find you disgusting:

Leaving toothbrushes lying sideways on bathroom countertops

Flushing toilets with the lid open

Using tea towels to mop the floor and then reusing them to dry dishes etc

Eating breakfast before brushing teeth

Wearing shoes in the house / bedroom / in bed

Wearing outside clothes in bed

Stepping barefoot after showering

Leaving dishes to dry with bubbles on them

Leaving cutlery to dry directly on the kitchen countertop

Letting sponges sit in the sink

Is this normal for the UK or is it just that I'm surrounded by students or just people with a poor concept of hygiene?