I rarely had problems with that. Then again I usually check out places as much as I can, before entering any training.
The K1/Kickboxing school I attended never really addressed self defense with the exception of how training raises confidence and a confident aura can deter you from getting picked as a victim (fair enough I’d say). Other than that it was just honest combat sports training and never advertised as anything else.
While I deem it important for myself to keep an open mind and learn from as many sources as I can, some stuff is just way too far out there.
But usually you can spot that stuff fairly easily with a somewhat experienced eye.
