"parr": Juvenile salmonid fish which have dispersed from the freshwater spawning site and are characterized by vertical striped markings ("parr marks") on the body.
Social media has some sort of odd bias against small fish. Perhaps it's because they don't make for the same sort of jaw dropping grip-and-grin photo as a 30+ inch kype-jawed brown trout.
Small trout are regularly referred to as "dinks," "guppies," and even "bait". I don't think all of it is negative or made with ill will, much of it merely playful ribbing between anglers.
These parr marked gems are some of the most beautiful creatures in nature. Kind of makes any negative remarks, even when made in jest, look foolish. At least in my opinion.
Give me parr marks any day.