Yeah, korean invasion is quite evident but thousands of filipino teachers and business establishments all over the country benefit from it.I used to be a an ESL teacher for 3 years when I was still in Ph and I can really attest the good gain that PH has experienced.It provides jobs to fresh grads and those not ligible to teach in public or big private schools.Welcoming this neighbors is also good for cultural exchange and/or awareness and of course..economy.I had a great experience with them though.
With regard to ill- mannered/abusive, they are just 5 out of one hundred.In some cases, its my fellows pushing them to behave negatively.Thats according to my 3 years of observation and experience guys!