I only officially *hate on* deliberate mangling. If you KNOW it's wrong, get it right. Slight derail- *hate* is WAAAY overused.
Au contraire, I LIKE deliberate mangling such as coming up with a new word by taking other words and mixing and matching, for example "fantabulous". It's playing with the language and is fun, for me at least.
Q: "How are you?"
A: "Fantabulous"

The reader/listener knows right away what the person answering means. Taking poetic license doesn't work when some jack-asterisk is making up random letters/words.
Q: "How are you?"
A: "Quorknishilus"

However, I agree that if the mangling stems from laziness... gggggrrrrr-irk.
Anyway, back on topic... Common Sayings That Are Commonly Misstated...
"In this day and age..." Redundant, dagnabbit! Both "Day" and "Age" in this context refer to a period of time. Such as "In this day..." or "The age we live in... ". Make the redundancy stop. Make the redundancy stop. Whoah! Day job view.
All the "LY" business others here have already mentioned drives me a little batty, too, e.g. "Drive safe!" Yes, I will drive as safely as is practicable.
Well, that about covers it. Good, I mean.
Aviary bawdy inn thistle tread rights Anguish reel god.