I have one non-tech friend working as phone support for one big ISP here in EU. It is residential ADSL. When I spoke to him about tcp port filtration, he swears

I have one non-tech friend working as phone support for one big ISP here in EU. It is residential ADSL. When I spoke to him about tcp port filtration, he swears that they did not filter any ports. Ofc ports 135-139,445 was in fact filtered, but even if I try to show him, he still won't believe.