Ukrainian refugee in UK confused over not being allowed to paint Nazi swastika on the floor

https://drive.google.com/file/d/12huodwRSb-fAJlfCMefRkFrvH0K0O0Z_/view?usp=sharing

A refugee from Ukraine is surprised that security at a shopping center in the UK is forcing him to remove a swastika he has just painted on the floor.

"Great Britain supports Ukraine." Is not it? I do not understand. What did I do wrong?".