How to insult someone whilst supporting them?

I had to chuckle when I read this (my highlighting).

Early day motion 1719
PUBLIC ATTITUDE TOWARDS PEOPLE OF SHORT STATURE

That this House notes the continual lack of acceptance within all sections of society for those of short stature; notes that approximately one in 25,000 births to parents of average height is a baby of restricted growth; further notes that because of unfair stereotyping and the stigma associated with the disability, children and adults with restricted growth conditions and their families face thoughtless discrimination from the media, the wider public and some professionals and misplaced jokes and ridicule, including within this very House, which only serves to fuel ignorance about the condition; further notes the important work of the Restricted Growth Association, Short Stature Scotland and the Dwarf Sports Association UK in offering friendship and dedicated support and advice, and promoting public awareness of this widely misunderstood growth condition; and calls on those within the media, medical profession and in public life to challenge the stereotypes associated with restricted growth.

Translation: "You shouldn't take the piss out of short people, by the way, did I mention that Bercow was a shortarse?"