Paul Farbrace said Sussex were outplayed for three days as they suffered their first defeat of the season.
They went own by nine wickets to Glamorgan at Cardiff in division two of the Vitality County Championship with the result secured inside three days.
Head coach Farbrace said: “Pretty ordinary performance really.
"Three days where we have been outplayed by the better team.
"They showed us how to bat and bowl on that surface.
"If you only get 270 in your first innings you are always chasing the game.
" I don’t think we were too cocky and arrogant, but I do think at times we didn’t show enough respect to the game and the pitch and that showed in us being consistently in both innings 160 for seven or eight. And you can’t win too many games of cricket when you only get 270.”
Sussex now prepare to face Yorkshire at Hove from Friday.
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