Was literally shouting at someone about this the other day.
Starting a sentence with "I mean" with no prior context should be punishable by fish vindaloo.
It sounds wrong but it's uber common, just look at Reddit - people start sentences with I mean... could just not type it and your point remains intact.
Americans also think "I could care less" is right... 'nuff said.
I don’t think that it’s a case of Americans thinking that it’s right, and my hand to God, I’m not here to defend them for its use.
I think that it’s more a case of a phrase that’s common currency over there, and people are used to hearing it, understanding it, and using it.
I read an article some years ago by Arika Okrent, a linguist with an M.A. in linguistics, and a Ph.D in psycholinguistics.
She stated that “I couldn’t care less” came into use circa 1945, and “I could care less” maybe in 1955.
She said that “I could care less” is perfectly acceptable now, and may have originated from, “No one could care less than I.”
Everyone can make their own minds up about it, but when I hear it, I know exactly what the speaker means, whether it’s grammatically wrong or otherwise.