I can go along with sticking out a tongue as a weird outdated tradition but sucking on it especially by a young boy that's some twisted shit especially by the spiritual leader of a country on top of that in a public display for the world to see.
I think he just lost most of his credibility with that one move. Normally that kind of thing would have him arrested and be charged but because of his position not likely anything to happen other his reputation marred for the rest of his reign

credibility for what? I think a lot of his philosophy is based, him doing this weird thing doesn't really change that