- "looks like" is associated with physical appearance - possibly things like clothes, jewelry, gender, hair, skin color, face, etc. - "sounds like" is associated with their speech - tone, accent, choice of diction - "acts like" is associated with physical behavior + speech
But anyway, I think the point is that, we don't know what mabbo's intent was and 95% likely it was totally benign, but CydeWes is pointing out that saying things like that has a harmful effect by propagating certain stereotypes.
Pointing out someone's implicit biases is not necessarily a personal attack on them. Everyone has them so we should welcome when people point them out (unless done in an mean-spirited or aggressive fashion).
Personally, when I read mabbo's comment, I thought, "Yeah, so true, good point!", then I read the next comment and I thought, "Oh right, thanks for pointing that out to me".