Can't I wear Guanyin in Thailand?

According to personal beliefs, you can wear it.

Thai Buddhism belongs to Mahayana Buddhism, while Buddhist relics such as Guanyin Bodhisattva and Maitreya Buddha Jade belong to Mahayana Buddhism. The two are just different branches and do not conflict, while Mahayana Buddhism and Hinayana Buddhism are actually from Sakyamuni Buddha, born from the same root and do not conflict.

In some people's cognition, Thailand is Southern Buddhism and Southern Buddhism is the top seat. Guanyin and other bodhisattvas are not recorded in the Sutra of Seats. Only Sakyamuni Buddha was called a bodhisattva before he became a Buddha.