does "prissy" and its synonyms have a positive or a negative meaning please?

prissy (adjective) Excessively or affectedly prim and proper. Synonyms: priggish, prudish, square-toed, straight-laced, tight-laced, victorian, puritanical, prim
Usage: A free-spirited party girl, I am the complete opposite of my prissy and well-mannered sister.
Thanks in advance!

Yes, no-one wants to be called 'prissy', or any of those other things.

I've never heard the term 'square-toed'.