One’s nationality has nothing to do with the validity of his argument..
I certainly don't agree with that. The papers today are full of the charges against 13 Russians who were propagandizing Americans as widely as they could to try to make the election go as they liked.
The same thing is happening here. If it's a foreigner, it's propaganda. IMO, the British government has a lot of concern about keeping their country totally disarmed, except for all the criminals. We are not helping with our gun freedoms and ability to defend ourselves, so far. So they are trying to turn us, with propaganda of this sort.
Don't be naïve, people! Of course we are being propagandized by other countries, as hard as they are able.
I would suggest knowing where your interlocutor is from: don't just assume he's American. They conceal it as best they can, of course, but this TT guy is probably British, from his language use. He sure isn't American.