Also in the etymological dictionary is geez as a derivative of geezer:
"geezer"
1885, variant of obs. Cockney guiser "mummer" (see guise).
Now, the problem with chiding someone on such an obscurity is similar to the teaching the Bible gives concerning 'knowing to do sin' and the contrast to 'innocence'. See eating food offered to idols and the extensive teaching thereon.
Bottom line: those chiding people for using a term innocently that the chider attends as offensive, the chider is being a busy body ... if the food is not known to the eater as having been offered to idols, then eating it does not incur wrong to the eater. As for myself, now that the derivative has been discovered, I shall refrain from using the phrasing because I do not wish to be an offense to my Lord.