The tiles in the shower are laid "crookedly"

Yes, I don't care whether I like the tiles or not, but if you write about 0.7 degrees, it should make sense to you that this is absolutely tolerable in a craft.

I also wrote "up to 1.2°C. That is at least something you can see. Why are there geometric tiles if it is apparently impossible to fit them properly on the wall? Maybe I am a bit strict. The whole joint pattern tilts to the right. Not just individual tiles, but almost everything. That bothers me.

By the way, this is how the tiles look nicely tiled (catalog photo):

Better even, than every tile different and thus different joint widths. That would really be miserable.

It's okay that it bothers you, but not every craftsman is equally good. You just had a bit of bad luck there. Re-tiling would be absolutely disproportionate. But you can try your luck...

OK. Then I will give it a try, but don’t count on too many chances for me.

With tiles this small, it is probably difficult to stay in a line?

At least it is such that you can see it.

Where do you see something? Right side? And not on the left? I don't see anything on the left... and this is about tile mats, right?
Could it be that the wall on the right is not straight? 1-2% is within the norm.

The entire joint pattern is tilting to the right.

Unfortunately, tilts of 1 degree are not visible if photographed perspectively. Also, the picture cannot be enlarged and put on a grid...
You should also be able to see it if it is not level (if you mean it tilts to the right, then it should also be visible on the horizontal line).
I myself see nothing, which would lead to no tip.