It doesn't even seem specific to UI design but design in general! We've been visiting a newly built indoor pool lately. The male / female shower/toilet signs are stylized so around 50% of people who get there first don't understand which is which! Also, the changing rooms are unisex single cabins that open both sides to let you enter to the bath area - but with no signage on them at all. So if you enter from the clothed side and all cabins are taken you stand in front of a white wall of doors with no idea what you should do next.

Designers! Fcking stop and think what you're doing if you change designs that have worked for many decades!