But looking closer at "I'm So Tired" by The Beatles, I noticed the following sentence:
" I'm so tired, I'm feeling so upset
Although I'm so tired, I'll have another cigarette
And curse Sir Walter Raleigh
He was such a stupid git"
Now Sir Walter Raleigh is the guy who is credited with introducing tobacco to Britain from America in the 16th century, and thus for indirectly getting John Lennon hooked on cigarettes.
And a "git" is an insult, so clearly Lennon seems angry :)