I think the blank stare was shock that you said "no" to start with, and after last time seeing how nice your yeard was he thought no big deal of coming over. Then after you said no, following it with all of your stuff being stolen the guy was just in shock and was rendered useless for the rest of the conversation.
I wouldn't say out of line is wrong, just walking the line. The guy was probably just thinking "holy crap" the entire way home and is more worried that all of your lawn equipment was stolen as he fears for his own.
Herm Edwards neutering offenses one QB at a time.