They didn’t say it’s offensive. They took an offence — as an individual. Insinuating that just because they’re based in a budget friendly country it doesn’t necessarily mean their output is of any less quality than that of their higher-paid counterparts (in the US presumably).

Which of course is totally not reflective of reality grounded in stats or anything. It’s just one in a thousand exception confirming the state of the tech world the OP has made a somewhat negative remark about.

This my interpretation anyway. Both persons are right in their own way.