Cause if you want to be pedantic, Jermery should have said "we'll" throw it too, as I was talking about multiple people.
The singular person, Snarf, would be referred to as "he".
But Jeremy said 'too' meaning 'also'. If the plural 'we' wasn't throwing shit to begin with, how can Snarf do it too? He can't. The 'too' was in addition to the actions in your statement. So it still refers to the person who was speaking before Jeremy. Namely, you.