I instantly became a purist when I saw Ep 4 Special Edition in the movie theater in 1997.
pi hated the CGI robots tacked on that looked way out of place on Tattooine. Greedo shooting first made me roll my eyes. While I thought the Jabba scene was interesting, I thought it took away from the anticipation of his big reveal in ROTJ.
i had no interest in seeing the other two SEs, and promptly bought the 1995 VHS copies as I knew then that they would never become available again.
And when I saw TPM in 99, I saw that Lucas had lost it. AOTC was even worse. As a consolation, I really did like ROTS, but the bad in the prequels clearly outnumbers the good.