I wouldn't worry about it. I do not understand the hypersensitivity about the extra e. I certainly do not see it...
as being any sort of "disrespect". The spelling Newsome (with an 'e') is significantly more common as a surname than Newsom (without an 'e'), at least in the United States.
According to data from the 2010 United States Census:
-- Newsome was the 1491st most common surname, belonging to approximately 23,958 individuals.
-- Newsom was the 3218th most common surname, belonging to approximately 11,218 individuals.
The spelling without the 'e' (Newsom) is often considered a variant of the more common Newsome spelling.
In my life, every Newsome I've known (friends, colleagues) all four of them... have had the e spelling. This seems like such a silly thing for people to get so upset over, or for anyone to be suspicious about you. It's a chat room, not a thesis paper. Not a wikipedia page. There was no confusion who you were referring to (or should I say "to whom you were referring"... you never know... I might upset someone.)