Well if he’s not a flamer, at the very least he’s a righteous git!

Flamer: One who flames people on the internet, often the wearer of asbestos underwear, a frequent participant in flame wars.

Linus has flamed plenty of people

For those who are missing some context, a flamer can also mean a very flamboyant ("flaming"), effeminate gay male [1].

[1] https://en.wiktionary.org/wiki/flamer

What do you think flamer means? You may be thinking of it in some other context.