Can a Sikh enter a buddhist temple with a turban?

As I went to worship at one of the most famous & sacred temples in Sri Lanka a Sikh person entered with his turban. As per the religious traditions we are not allowed to wear any head coverings while entering the temple & worshiping. When the particular person was asked to remove it he didn't & he worshiped with the turban saying it complies with the international laws. I see this disrespectful as, 1. It's a must for visitors entering the Sikh temples to wear a head cover. 2. Even the Kings have removed their crown when worshiping Lord Buddha. 3. As per the scripts many religious leaders who were there during the time of Lord Buddha has paid a lot of respect & has considered Lord Buddha superior. Can I please have your views regarding this. May the Noble Triple Gems bless you!