Ah, another post on Reddit from a few days ago, his friend telling his side of the story:

"Really need help.

Friend Oliver Niyonsaba was here on a holiday from Australia and whilst in a nightclub (walking st) found a purse left in the toilet , he came out asking us who's bag it is as we were in a big group of around 10 people. The woman who owned the bag saw him carrying it and thought that he stole it and continued to phone the police while using racial slurs on him since he's black and even slapped him . He is now locked up in soi 9 pattaya police station and is supposed to leave on a flight tomorrow . Anyone know anyway to solve this problem?

UPDATE 1: We were a bit too late , we had the right people to try and free him but this problem has already been sent to court and he's been transferred to Nong pla lai prison by the time we got to the soi 9 police station. We have been told that the court will set the bail and now seeking for lawyers. Family and friends have been informed and all are willing to pay bail .

UPDATE 2: We have a new witness , a totally different person that seen what had happened , they agreed with what we all say but saying that , Oliver made a huge mistake signing a paper in Thai that he did not understand. He told me in prison that the police told him that if he signed it then it'll be easier for him and he can go home soon . We now have hold of his passport and telephone where bail is set at 100,000 baht where he can leave the country and never to return back to this place . Best news for us"

thats some bad karma;

to respond,easy to leave Thailand, enter Cambodia by land border( done it )
BUT wont be able to pass thru immigration at airport as no entrance stamp

He will just need wait it out, advise him to get the witness statement taken at the police station IN THAI so he can use them at court in case they need to leave...

Questions;
1.what was he doing in the women's toilet ??

2.This is from the bangkokpost link, ....The Australian allegedly stole valuable items from a bag belonging to Thannayalak Nasuhai, 40, police said.