I was just in Pai for the past 3 days. I witnessed foreigners being pulled aside and ticketed for smoking weed. Last night the big district cop did a walkabout surrounded by the media. There are now posters and signs everywhere notifying you to not smoke weed in public. I also saw signs instructing people to cover up and be respectful. Sadly, this all feels like too little too late.
I've been visiting Pai for over 20 years, long before they had traffic lights and 7-11s. Just in the past year or so the place has changed entirely (again). It's suddenly now become a place for rowdy pub crawls, and river tubing with multiple stops along the way offering booze and weed with obnoxiously loud music. There are far too many shirtless young men revving their little scooters up and down walking street. The majority of the tourists now (90% maybe) are Israelis, and their vibe clearly indicates that they don't gaf about other people, they want to party loud and hard. Pai in general is now crowded as hell too. The banks of the river are lined with garbage and plastic waste. It's over. Whatever cool vibe Pai used to have is long gone. If you're thinking to visit to see for yourself, prepare to be massively disappointed.