discrimination moment of the day

so, at work today, i was working as usual. there was a few people from a cleaning company who were also there (since our store in a few hours!), and one of the guys was trying to clean something near the ceiling in a really stupid way. i happened to glance over, just looking around cuz our store's really pretty, and i happened to catch his eye for a split second randomly. then, he said to his fellow caucasian co-worker, 'she must be thinking, "dumb americans!"' i don't know why, but why do American people automatically assume that Asians don't speak English? AGH, anger. :(

ps. on friday (june11), my boyfriend drove up from maryland to new jersey to see me. i had an amazing day <3