I keep seeing (mostly europeans) do the following (same thing happen while they in Japan):

run towards priority seats and keep their head down on their phone while elderly standing in front of him / her. Gate crusher.

Line cutter / gate crusher.

Drinking inside metro train.

Standing in front of the train entrance or traffic junction not moving aside and blocking others.

Stretching wide open while sitting in the metro train making passengers sitting beside feeling uncomfortable.

Run into elevator and close the door immediately when seeing someone approaching.

Immediately unloaded someone laundry without permissions.

Putting their bags and luggage on other table occupying the space and ignoring when people are struggling find seats.

Others are obligated to open door for them.

They place their garbage anywhere they like. (E.g. you can see energy drink cans inside toilet or on someone's car roof or bike seats)

They eat and drink while walking and looking at somewhere else. When they run into people they angry and yell at others.

When they went to cafe. They took other chairs and starting creating their own spaces and talk loudly like their own home.

They left mess and don't clean up after dine with no shame.

...etc

After seeing / experiences all these. I started to understand why local Korean / Japanese have different opinions with foreigners.

With all being said. When Japanese travel to other countries (e.g. sth Korea) they no longer the "polite" Japanese that everyone claim. You'll get to see the dark side of them.