Yup, absolutely no grammatical problem in VVD's post there. 'Funnily enough', both words being used as adverbs, is an adverbial phrase; that adverbial phrase is being used to modify the previous clause: "Neither do I".
To quote Crystal directly:
"Adverbials perform diverse roles in sentence construction. Some add information about an event; some link clauses together; and some add a comment about what is being expressed."
Other examples of often used adverbial phrases include 'terribly slowly' and 'very quickly indeed', or even 'quite soon'.
Whob's error was twofold- first in assuming 'enough' was an adjective when it was not, and then again in assuming that those two words in the second clause had to refer to each other, when in fact they were both referring to the previous clause.
Not the first time you have been wrong about English, whob, and yes, I am an English teacher, and yes, you can try and claim that my English is no good until the cows come home, but the fact is that it is always you that is in error and this thread is just proof of that again
As for the thread title- you need to look at what grammar and spelling are actually FOR. They have a purpose. If they are not being well observed in some areas, you should probably look for causes as to why those purposes are being eroded.