While I'm sure more can added, this topic has been discussed a few times before. I think these answers (by u/tiako (2), and u/einhverfr) may be helpful. reddit.com/r/AskHistorians/comments/13tmxl/ive_often_heard_it_said_that_the_ancient_romans/ reddit.com/r/AskHistorians/comments/17r3o2/racism_in_the_ancient_world/ reddit.com/r/AskHistorians/comments/2izuqc/how_would_i_be_treated_in_ancient_roman_as_a/cl72gxb/
There's actually a FAQ on race in the ancient world and I recommend /u/cleopatra_philopater's posts especially:
On perceptions of race and particularly black people in the Roman Empire/Ancient Mediterranean