i have seen a homeless metally disturbed woman take a <deleted> on the sidewalk in the middle of lower sukhumvit, but that's not the point. The guy in the tuk tuk was not mentally disturbed, homeless, or disadvantaged in any way.
Admittedly, this whole find the outlier and publish it on social media to shame the farang for karma and likes thing is out of hand, but the behavior itself is fairly unforgivable.