Welcome to YT. I have a floppy eared yorkie too.
5.5 pounds is within standard. Actually so are "teacups". The standard is 7 lbs and under. Any pup under 7 lbs is a standard sized Yorkshire terrier.
I do understand your comment on putting other dogs down. My floppy eared fellow is on the higher end of the standard, weighing in at 7 lbs. at a yorkie meetup there were only tiny yorkies and the owners did not allow their dogs to play with mine. It was so sad and it made me feel horrible.