What’s funny to me, is that HE can probably SPELL ‘bum.’
[spelling rant]
What is it with words like bum, bumper, and jamb, that some people can’t spell them? How many times have I seen someone say their “bumber” got hit? I’ve seen tons of people call it their “door jam.” Laptop seems to be a tough one for people who call it a “labtop.”
My best guess is that these people don’t read much, so their exposure to these words is strictly aural. So, having never seen these words in print, they are left to spell at their own discretion (with limited success).