I can't take credit for this speculation

But an interesting notion I read on the web:
So Zeke and Kate are in the shower room, Kate says 'I ain't showering in front of you' or something to that effect, and Zeke chuckles and says 'You're not my type.'
Now, the first thought that would spring to mind is 'he's gay.'
But that's a little obvious. I wonder instead if maybe that was an inside joke he was making referring to blood type, since after Zeke leaves the shower stall Kate sees she has that bandage on her - blood sample taken?
Not sure of the signif. but definitely interesting.