People who...
pronounce 'th' as 'f'.

People who use the phrase 'to be honest' (or it's sibling 'if I'm being honest') - because they almost certainly are not.

The news - because it's mostly opinion masquerading as fact. eg "a shocking incident occurred today". An incident it maybe, but why use an adjective unless it's about making your news programme more popular than your rivals'?

[edit] One further peeve is people who say 'baby' (eg "what's baby's name" or "how does baby feel") without using 'the' or 'your' (or other equally useful pronouns*)

*may not actually be pronouns, my 1980's comprehensive education wasn't all that comprehensive
(spiggytopes, Tue 5 Apr 2011, 2:06, 8 replies)

that's a bit scary
because I just used that phrase 'to be honest' and I wasn't being honest at all.
Spoooooooky.
(also, you must be grinding your teeth with rage in my direction)
(Monkee girl not a monkee, not a girl, Tue 5 Apr 2011, 4:05, closed)

the and your
I'm pretty sure 'the' is a (definite?) article and 'your' is a possessive pronoun...
(ComplexStuff Was confused by life on, Tue 5 Apr 2011, 7:21, closed)

Possesive pronoun, do you mean it keeps ringing up to find out where you are?

( number5 has been fighting tramps and losing., Tue 5 Apr 2011, 8:19, closed)

Your is a possessive adjective.
The possessive pronoun is yours.
( The Awful Puppy Bakery is still bored, Tue 5 Apr 2011, 9:14, closed)

I say "to be honest" quite a lot
and it pisses me right off. I can't stop myself from doing it though....
( Vipros. clever got me this far, then tricky got me in, Tue 5 Apr 2011, 9:51, closed)

f and th
My parents tried teaching me this when I was a child but I just couldn't hear the difference. And then, in my thirties, I got it. I don't know why this is.

Trying to correct your speech patterns in your thirties is no joke.
(BearWithLittleBrain, Tue 5 Apr 2011, 10:20, closed)