Oakland A's catcher Bruce Maxwell -- the only MLB player who took a knee last season -- made "anti-police statements" and cussed out officers during his gun arrest ... this according to the police report.

26-year-old Maxwell was arrested for assault with a deadly weapon and disorderly conduct in Scottsdale, AZ on Saturday after allegedly pulling a gun on a food delivery woman.

According to the police report, obtained by TMZ Sports, the woman says she was making a routine delivery from Geno's Pizza and Cheesesteaks in Tempe when Maxwell answered the door and stuck a gun right in her face.