Just arrived yesterday, went with my mates for a beer (Sukhumvit)and got a few stories about banned in bars.

Some bars banned people just for silly thinks (i am been told), seems to me that they have enough costumers/turnover so they dont care anymore

I think the important parts of your post are -

"stories in bars"

"for silly thinks [sic](so I am told)"

People who get banned from bars very rarely think it was their fault..

totster

snicker snicker, Totster.

People that gets banned often scare away other customers.