Several "Americanisms" piss me off!

"Reaching out" when talking/contacting someone.
"I'll get a...." as opposed to "please can I have"

Plus spelling.

Z used in place of S, example colonize and colonise
S used in place of C, example offense and offence

Both examples used in this thread by, I assume, people educated in the UK..

Funnily enough though, the omission of the letter U in words like colour doesn't bother me. Hey oh.