It's wrong, but it is quite a good mistake I thought!

No, I'm useless at spotting things like that

That jumped out at me but I cannot think of any more I have noticed recently.

The howlers that make me groan most (and I'm ready to duck now) are those in the thread headers here on GN. How hard is it to check before you carry on writing and hit the post message button? They distract me from the original message and I always want to post some glib comment but I've resisted so far...I can think of several recent ones but won't list them, that'll be a bit unkind. But I expect others will remember some too...

I agree, mollie whip and wipe spring to mind.

Oh dear, I mentioned that one on another thread

It's because we are, most of us, on portable devices that have minds of their own. The whip/wipe was most certainly down to that.

A good friend always types throught instead of thought. On fb yesterday I read we're when the person meant where, as for those who can't use the correct their they're or there

Dessimation instead of decimation was another, and Rddie for Eddie...apologies for being so picky. The whip for wipe was a shocker - I wasn't sure what to expect: kinkiness or issues? I know why these mistakes happen but they irritate the heck out of me...

Can't remember where I first came across this one, but I've seen it a few times lately - defiantly instead of definitely. It can prove to be quite amusing!

I have a few:
Expression instead of espresso;
Escape goat, instead of a scapegoat;
Mute point;
damp squid;
Baited breath;
And here in Scotland, 'he jamp off', instead of jumped.

expresso

Of when it should be have. Grrrr!

It's when it should be its and vice versa...

My DS makes his own words up all the time, or think he's got it right when he really hasn't and he just makes me laugh.

Nana, thought it was 'jampit!

I was amused when somebody recently announced that her furry had been aroused but was much too tactful to point this out. Similarly referring to what I assume was meant to be a trug as a trough, but maybe again, the couple in question might have been very very strong and able to carry a trough around with them.
Charitably, one should blame iPad/iPhone predictive spelling.
I heard today of a friend of a friend who emailed an art dealer recently to get an estimate for 2 canal paintings she wished to sell. She got a very polite reply suggesting she might like to start the word in question with the "missing C" the next time she wrote.

If I had read (as opposed to heard) "self-depreciating" in the context given in the OP, I would have simply assumed that it was a typo. I don't know about anyone else, but my fingers often add superfluous letters when I'm typing, and such errors are very easy to overlook when doing a quick spell-check.

Why did I just know I'd get it as soon as I clicked on 'post message'?...

My friend who was very good at book-keeping and accounts, always refereed to the Customs and Exercise, instead of Custom and Exise

Ooh...!!!

It's no good - I'm sure you meant to type Customs and Excise, PRINTMISS

Anna: you beat me to it

Or even referred and not refereed